15 August 2015, Volume 46 Issue 15-高分子
    

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    研究 开发
  • Microstructure and physicochemical properties of type I collagen fibrils from bovine tendon
    Haiyan Ju ; Nian-hua DAN ;
    . 2015, 46(15-高分子): 1-0.
    Abstract ( ) Knowledge map Save
    In the paper, type I collagen fibrils（CF）from bovine tendon was successfully prepared by the enzyme hydrolysis method，and its secondary structure was similar with the molecular structure characteristics of type I collagen. AFM results showed that CF had even thickness with a diameter of 135 nm ± 5.00 nm and enjoyed the D cycle horizontally striped structure, and the micro porous network structure was present with uniform dispersion in aqueous solution. The tensile strength and tensile elongation of CF samples were respectively 1.293MPa and 93.77%. The hydrophobic property of the CF samples with a mean contact angle of 68.9° were better than pure type I collagen. The bibulous rate，holding water rate and water vapor permeability rate of the CF samples were 37.13%, 19.44% and g/(m2/d), and the mean porosity was 89.54%.Average cumulative adsorption and desorption of specific surface area of the CF samples were 8.4251 m2/g and 12.8046 m2/g, and the results presented the characteristics of large volume, small specific surface area and large pore size. The results provide a new reliable theoretical basis for deep processing, molding and application of natural collagen fibrils.
  • Salt Absorption Thermodynamics and Kinetics of Super Absorbent Polymer Based on Wheat Starch
    LU Cong-Cong
    . 2015, 46(15-高分子): 2-0.
    Abstract ( ) Knowledge map Save
    Abstract：The fluid and salt ions absorption rate of the super absorbent polymer (SAP) was determinated in Nacl、Kcl、Mgcl2 and Cacl2 solution, and the adsorption characteristics of SAP thermodynamics and kinetics of Nacl and Cacl2 were studied .The results shows that the salt ions absorption rate of SAP is related to the cation of the solution, the bivalent cation absorption ability is far less than monovalent cations. The equilibrium constant b and speed constant ks of absorbing Na+ and K+ are much greater than that of absorbing Mg2+ and Ca2+，and the higher the temperature the greater the equilibrium constant b and speed constant ks. The adsorption thermodynamics of Nacl、Kcl、Mgcl2 and Cacl2 is complied with the laws of Langmuir equation. The adsorption kinetics result illustrates it fits to the Pseudo一second order equation.
  • Effect of coagulation bath composition on the membrane-forming and properties of PVDF /TA-ATP hybrid membrane
    ;;;;;zhao yi ping
    . 2015, 46(15-高分子): 3-0.
    Abstract ( ) Knowledge map Save
    In this work, attapulgite modified by tannic acid (TA), PVDF and porogen polyethylene glycol (PEG) were mixed and PVDF/TA-ATP flat sheet hybrid membrane was prepared by the method of phase inversion. The thermal properties and morphology of the hybrid membrane was characterized by Differential scanning calorimetry and Scanning electron microscopy, respectively. The effect of coagulation bath composition on the hybrid membrane in membrane-forming progress and then the pure water flux were studied by the method of thermodynamic phase diagram and ultrasonic reflection. The results showed that by adding more ethanol and DMF to the coagulation bath, more non-solvent was needed for phase separation, and the membrane-forming speed slowed significantly, the pore structure changed from finger-like pores with density skin into sponge-like pores without skin, the pure water flux increased.
  • The research on the material of hyaluronic acid, collagen and poly (ethylene glycol) Diacrylate composite hydrogel
    Jing YUAN ;Jing-Hua CHEN
    . 2015, 46(15-高分子): 4-0.
    Abstract ( ) Knowledge map Save
    Aiming at the brittleness of hyaluronic acid (HA) and collagen (Col) hydrogels in mechanical properties, this work was to prepare a composite hydrogel with biocompatibility and high strength by two-step cross-linking method. Hydrogels with different weight percent of HA and constant Col and poly (ethylene glycol) Diacrylate were obtained to tune the physical and chemical properties. Subsequently, L-lysine was used to modify the hydrogels. The SEM results show the honeycomb morphology and the pore size of the ternary hydrogel ranges from 80-180 μm . When the concentration of L-lysine is 40mM/L, the comperssion modulus reaches 414 kPa which is 19 times of non-modified hydrogels. Cell toxicity and implantation experiments indicate that the extracts of hydrogel has no obvious inhibitory effect on MC 3TC-E1 cells, and the slight immunological rejection on mice. This kind of composite hydrogel has great potential in cartilage repair.
    • 工艺 技术
  • PVDF/PMMA/PEG Polymer Diaphragm Preparation
    . 2015, 46(15-高分子): 5-0.
    Abstract ( ) Knowledge map Save
    Lithium ion battery gel polymer electrolyte used instead of traditional liquid electrolyte has many advantages, the gel is a kind of special state between solid and liquid, gel polymer electrolyte has both solid electrolyte and good mechanical properties, but also has similar conductivity of liquid electrolyte ion, which plays an important role to improve the comprehensive performance of the battery.The main research of this topic is the contents for modified the PVDF polymer material, the concrete content is that blend PVDF and PMMA polymer, then add the plasticizing PEG-400, with the modified of the wet process（dry-wet process）to make it.Through testing the porosity and fluid absorption rate, the combination of scanning electron microscopy SEM and electrochemical workstation to test the sample characterization, finally the best one is: polymer of solvent percentage is 8%, PVDF: PMMA = 7:3, plasticizer content is 30%, the solvent content is 3%, the reaction temperature is 45 ℃.Ionic conductivity of PVDF/PMMA/PEG polymer of up to 2.848mS/cm, the electrolyte system compatibility and conductivity is significantly improved.
  • The Synthesis Process of Beryllium Containing Polycarbosilane
    . 2015, 46(15-高分子): 6-0.
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    Abstract: The precursors of beryllium containing polycarbosilanes (PBeCSs) were prepared by the reaction of polycarbosilanes (PCS) and beryllium acetylacetonate [Be(acac)2] at 220-260 ℃. The influence of beryllium content, reaction temperature and reaction time to the precursors was measured by FT-IR, NMR, GPC, XPS et al. The results showed that the completion of the reaction of PCS and Be(acac)2 was based on the consumption of Si-H bonds, and the precursors had a the enol form structure imported by Be(acac)2, and the molecular weight and polydispersity of PBeCS were increased after increasing beryllium content while the content less than 0.8 wt%, but decreased at a high speed while its content was 0.8-1.00 wt%, and the molecular weight and polydispersity of PBeCS were also increased while increasing the reaction temperature and the reaction time, and the increasing of carbon and oxygen content in the PBeCS introduced from Be(acac)2.
  • The effect of the Shish-kebab Structure formation of middling-PE molded by Dynamic Packing injection
    mars
    . 2015, 46(15-高分子): 7-0.
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    The influence of self-enhancement and shish-kebab of the middling-HDPE added High Molecular Weight PE and low Molecular Weight PE was studied by using the self-designed and self-made dynamic packing injection molding( DPIM) equipment.Testing results show that tensile strength of dynamic sample was 111.6 MPa at 160℃, which is 4.56 times as high as the static one (24.2 MPa) and approximately increased by 355.5%;It is known that,from the test results of Differential scanning calorimetry(DSC),scanning electron microscopy(SEM) and wide-angle X-ray diffraction(WAXD), the interlocking structure of shish-kebab was generated under the acts of DPIM.Adding High Molecular Weight PE can be beneficial to the formation of Shish-kebab spine fiber crystal and the thickness of lamellar crystal was benefit from adding Low Molecular, so as to improve the property of Shish-kebab.
  • Analysis on Curing Process of Epoxy Resin/Polyamide System
    Chen Ping Zhao-Hailin
    . 2015, 46(15-高分子): 8-0.
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    The DTA method was used to investigate the curing process of epoxy resin and polyamide system. Effects of the amount of curing agent/ type of modifiers/cenosphere were studied. The result showed that curing promoter and cenosphere can promote the reaction and make the reaction temperature lower than before. The amount of Curing agent and diluents have little effect on reaction temperature.According to the experimental results, We determine the pre-curing temperature is 80℃ and preparing the sample. Testing the curing sample and then decide the Post-Curing temperature is 120℃. Analysis the specimens made by different curing system by FTIR and Calculating the area of epoxy peak by internal standard method, determined the optimal curing system is Pre-cured at 80℃(120min),Post-cured at 120℃(30min).
    • 研究 开发
  • Enzymatic Grafting of Eugenol-bridged Jute fiber with Acrylamide
    ;Ai-Xue DONG;
    . 2015, 46(15-高分子): 9-0.
    Abstract ( ) Knowledge map Save
    Enzymatic processes provide new perspectives for the hydrophilization modification of jute lignocellulosic fiber. First, eugenol as an intermediate monomer was grafted to the lignin-rich jute fabric catalyzed by laccase. Then, further grafting polymerization of acrylamide to the Eugenol-bridged jute mediated by laccase/tert-butyl hydroperoxide (t-BHP) was investigated in this study. The results showed that eugenol could be grafted to the surface of jute via the catalysis of laccase and the C1s peak of C=C was observed at 283.49 ev in XPS spectra. The best grafting conditions measured by a bromine method were 50℃, pH 4, 4 h, eugenol concentration of 5 mmol/L, laccase dosage of 1.68 U/mL for grafting rate of 1.06%. FT-IR spectrum of acrylamide-grafted Eugenol-bridged jute showed obvious characteristic peaks of amide groups, which revealed the existence of grafted acrylamides on the jute fibers. The grafting rate of acrylamide onto the jute fiber was 4.26% determined by the micro kjeldahl method.
  • Micro theoretical Study on the Compatibility and Mechanical Properties of Polyacrylamide/Polyvinyl alcohol Blends
    Mingming Yang
    . 2015, 46(15-高分子): 10-0.
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    The theoretical method of molecular dynamics is applied to study the PAM/PVA blends at the level of microscopic molecular interaction. The interaction mechanism and nature of PAM/PVA blends are elaborated from the aspects of the compatibility, binding energy and the correlation function analysis, respectively. We have analyzed the static mechanics of system with different quality components, and studied the effects of different quality components on the mechanical properties of system. Results show that the compatibility between PAM and PVA is very good, and the binding energy between the single component of system is decreased with the increase of PVA content, the main reason is that the number of polar functional groups contained in a PAM chain is higher than the same quality PVA chain. In addition, the analysis of the correlation function shows that the single component interacts with each other mainly by hydrogen bonds, and the possibility relationship of the hydrogen bond which formed between the amine groups (-NH2), carbonyl groups (-C=O) , hydroxyl groups (-OH) and the hydrogen atoms around them is O(-C=O) > O(-OH) > N(-NH2). This is a reflection of the polarity relationship among the amide groups, carbonyl groups and hydroxyl groups. The static mechanical results of models with different component quality ratio show that, with the increase of PVA content, the elastic coefficient, the various engineering modulus and Cauchy pressure value are all increased, namely the increase of PVA content can significantly improve the mechanical properties and ductility of PAM.
  • Preparation and characterization of modified UF resin/paraffin phase change micro-capsules for storing energy
    Ru XIA
    . 2015, 46(15-高分子): 11-0.
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    In this paper, the modified UF resin/paraffin micro-capsules were prepared by microencapsulation technology with melamine modified urea-formaldehyde resin as capsule wall and anionic and non-ionic paraffin emulsion as capsule core. The results showed that when the material of capsule core is anionic paraffin emulsion prepared by Stearic acid and ammonium hydroxide, the mass ratio of the capsule core and wall is 1:6, we can prepare the micro-capsules whose coating rate is 52.41%, average particle size is 20 m, wall thickness is 500 nm. The micro-capsule’s enthalpy is 166 J/g, has great effect of phase change energy storage.
  • Study on Preparation and properties of high performance waterborne UV-curable polyurethane emulsion
    Jiapeng Qi;
    . 2015, 46(15-高分子): 12-0.
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    In this paper, high performance waterborne UV-curable polyurethane emulsion was prepared with isophorone diisocyanate (IPDI), pentaerythritol triacrylate (PETA), 2,2-bis (Hydroxymethyl) propionic acid (DMPA) and hexamethylene diisocyanate(HDI) trimer. Subsequently with the polyurethane emulsion as film forming material, and light initiator 1173 transparent UV cured coating was formed. The structure and properties of waterborne UV-curable polyurethane were characterized by fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (1H-NMR).Additionally, the heat resistance of TWPU was determined by thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC).Furthermore, the properties of the emulsion and the films were compared with the commercially available waterborne waterborne UV-curable polyurethane emulsion. The results showed that the UV-curable polyurethane emulsion has smaller particle size, higher activity and the film formed from such emulsion had betterhardness, wear resistance and waterproof effect.
  • Synthesis and Characterization of hyperbranched waterborne polyurethane based on acid type chain extender
    ;
    . 2015, 46(15-高分子): 13-0.
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    With diethanolamine (DEA) and succinic anhydride as raw materials and methanol alcohol as solvent, a new carboxylic acid type of hydrophilic monomer DMCA was synthesized. The best conditions for synthetic hydrophilic monomer were: temperature 0℃, mole ratio 1:1.2, time 80 min, solvent dosage was 300ml/mol (DEA). Under the best conditions, the conversion rate had reached 86.18%. The structure and performance was charaterized by FT-IR, 1H-NMR, XRD, TG and element analysis. Hyperbranched waterborne polyurethane DMCA-HWPU was synthesized by using DMCA as hydrophilic chain extender. Performance test results showed that: DMCA-HWPU system is non-crystalline, the emulsion is milky and blue light without precipitation, has high emulsion stability and good thermal stability.
  • In-situ preparation and properties of high intensity self-supported PAN-based gel polymer electrolyte membranes
    ;;
    . 2015, 46(15-高分子): 14-0.
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    The chemical crosslinked polyacrylonitrile based gel polymer electrolyte (PAN-GPE) membranes were prepared by in-situ polymerization. The molecular structure, tensile strength, ionic conductivity and thermal properties of PAN-GPE membranes were detected with the infrared spectrometer, universal testing machine, electrochemical workstation and integrated thermal analyzer. The influence of divinyl benzene (DVB), ethylene glycol dimethacrylate (EGDMA) and polyethylene glycol dimethacrylate (PEGDMA) to PAN-GPE membranes were investigated. The results indicate that the crosslinkers can significantly improve the tensile strength. EGDMA is the most efficient to improve the tensile strength. The tensile strength of GPE membrane is improved from 0.26MPa to 5.87MPa by adding EGDMA 2.5% (mass of monomers). In the experimental content, the crosslinkers have little effect on ionic conductivity of GPE membranes.
  • Study on porcine acellular dermal matrix crosslinked by triglycidyl isocyanurate
    Nian-hua DAN ;;
    . 2015, 46(15-高分子): 15-0.
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    Abstract: Triglycidyl isocyanurate (TGIC)was used for crosslinking porcine acellular dermal matrix(pADM) ，the effect of reaction temperature ,pH,dosage of TGIC and reaction time on shrinkage temperature(Ts) of matrix material was investigated. The physicochemical properties of matrix material before and after were characterized ,such as SEM,FTIR, mechanical properties,thermal stability,enzyme degradation properties and contact angle.The cytotoxicity of matrix materials was tested.The results indicated that the shrinkage temperature of matrix materials reach up to 84℃ when the reaction temperature was 37℃, the pH was 9.2, the reaction time was 16-20 h,dosage was 10%. After crosslinking，morphological stability，the thermal stability ，enzymatic resistance ，mechanical strength and hydrophilicity　 of matrix matetial were all improved．The matrix material still retain its cell biocompatibility，and the evaluation of cytotoxicity was gradeⅠ.
  • Synthesis and UV-Curing Kinetics of Waterborne Polyurethane Acrylate modified by Organic Silicon
    ;;;
    . 2015, 46(15-高分子): 16-0.
    Abstract ( ) Knowledge map Save
    Abstract: The PUA prepolymer with isocyanate ending group has been prepared by the addition of isophorone diisocyanate (IPDI) with the mixture of polyethylene glycol (PEG600) and hydroxyl-ending polydimethylsiloxane (PDMS). And then using dimethlolpropionic acid (DMPA) as a hydrophilic, pentaerythritol triacrylate (PETA) as an UV-curing groups and triethylamine (TEA) as a neutralizer, the waterborne polyurethane modified with organosilicone (WPUA-Si) was eventually obtained through the emulsification. The structure and property of the WPUA-Si oligomer were characterized using infrared spectroscopy (FTIR) and TG. The results show that water resistance and thermal stability of the UV-cured film of the WPUA-Si oligomer was improved. The UV-curing kinetics of the WPUA-Si oligomer was also investigated by real time FTIR. When the amount of photoinitiator Darocur1173 was 5 wt.%，UV-curing rate of the WPUA-Si oligomer was quickly and the conversion of the double bond were higher up to 90%. The light intensity of the radiation can increase improve the UV-curing rate of the system.
  • Synthesis of mussel-inspired polyvinyl alcohol adhesive gel
    ;;;
    . 2015, 46(15-高分子): 17-0.
    Abstract ( ) Knowledge map Save
    In this work, we grafted polyvinyl alcohol (PVA) with a functionality of adhesive structure, 3,4-dihydroxybenzaldehyde, to obtain a mussel-inspired modified PVA (m-PVA). Firstly, m-PVA was synthesized with PVA and 3,4-dihydroxybenzaldehyde via acetalization. The m-PVA was characterized by UV-spectra, FTIR and H1 NMR, which confirmed the catechol was grafted in the polymer. And the grafting ratio is about 10%. In addition, the thermal stability of m-PVA was also measured by TG analysis method. For mimic of mussel adhesive protein gel, UV-spectra were used to study the formation of m-PVA adhesive gel, which was obtained by coordinating with Fe3+ with different pH. UV-spectra were also used to investigate the formation of m-PVA adhesive gel, which formed by oxidation of NaIO4 that can oxidize the catechol to form quinone. Through our primary work, adhesive gel was synthesized successively, which mimics mussel adhesive protein gel to some extent.
  • Preparation of β-Cyclodextrin Cavity-based high oil absorbents
    . 2015, 46(15-高分子): 18-0.
    Abstract ( ) Knowledge map Save
    Abstract: Introducing the mono substituted olefin to the external cavity, the β-cyclodextrin derivative became a lipophilic active macromer β-CD-A containing polymerizable bounds. Selection of soft monomer hexadecyl acrylate (HDA), and hard monomer styrene and β-CD-A, the suspension copolymerization prepared copolymer high oil absorption resin PCDHS with cyclodextrin based three component copolymer. The impact of β -CD-A dosage, the ratio of soft / hard monomer, crosslinking agent on the properties of resins, and determine the best process. Were discussed in this paper. The results showed that the oil absorption ratio of PCDHS, the high oil absorbing resin on gasoline, toluene, chloroform and CCl4 were respectively 25.6 g/g, 37.2 g/g, 45.3 g/g and 54.6 g/g, the oil retention rate is as high as 90%.
  • Preparation and property of HKT800 carbon fiber/AG80 epoxy resin composite
    Hong-Xing GU;
    . 2015, 46(15-高分子): 19-0.
    Abstract ( ) Knowledge map Save
    The surface topography, elements, functional groups of HKT800 carbon fiber were characterized, the recipe of AG80 epoxy resin was optimized, then the mechanical and interface performance of HKT800 carbon fiber/AG80 epoxy resin composite were analyzed. The results showed that: the ratio of O/C and N/C in surface elements reached 25.2 % and 4.5 %, the ratio of active carbon atoms was 0.91, so the surface activity of HKT800 carbon fiber was higher. The epoxy resin could be cured at 150 ℃ when the mass ratio of AG80, DDS, BF3?MEA was 100 : 30 : 3. The tensile, flexural and compression strength of HKT800 carbon fiber/AG80 epoxy resin composite were 2682 MPa, 1874 MPa and 1639 MPa, interlayer shear strength was 110 MPa.
  • The synthesis and performance of biodegradable polyester amide copolymer
    Yue-Jun LIUZheng-yang FENG;Hong DAI
    . 2015, 46(15-高分子): 20-0.
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    Succinic acid-butanediol-1,6-hexamethylenediamine polyester amide copolymers with Mw from 40000 to 65000 were synthesized by succinic acid, 1,4-butylene and 1, 6-hexamethylenediamine，through high temperature melt reaction. Meanwhile，the second dibutyl tin laurate was selected as catalyst, and the toluene disocyanate (TDI) was selected as chain extender. The succinic acid-butylene-adipic amine copolymer films were prepared by rolling film-forming method. The influences of the content of 1, 6-adipic amine on the copolymer performance of thermal, crystallization, degradation and rheological properties were researched. The results showed that the polyester amide copolymers were synthesized successfully, whose melting point is 100.97 ℃ and the thermal decomposition temperature is 317.85 ℃. With the increasing of 1, 6-adipic amine, the tensile strength of copolymers increased accordingly, and the elongation at break decreased slightly. 1, 6-adipic amine did not change the crystal type of copolymer, but the crystallinity of copolymer decreased. With adding the 1, 6-adipic amine in copolymer, the degradation performance and rheological properties of the copolymers were improved, which is useful for the further processing.
  • Study on Surface Morphology and Anti-adhesion Performance of PDLLA/PCL Blend for Medical Use
    Yang Fan-Wen ;;;;; ;
    . 2015, 46(15-高分子): 22-0.
    Abstract ( ) Knowledge map Save
    5 kinds of Poly laitic Acid (PDLLA)/Polycaprolactone (PCL) blends for medical use were prepared by melt process, and the films were prepared by extrusion casting. The surface morphology and section height curve of these films were studied by Atomic Force Microscopy (AFM). Compared with the pure PDLLA, the surface of PDLLA/PCL blends is relatively smooth, the section height curve amplitude decreases, the highest bulges decreased from 800nm down to 180nm below. The addition of PCL could improve the surface flatness of the blends, obtained more smooth appearance, which was caused by lubricating and PDLLAsticizing effect of PCL with the lower molecular weight. The blends with 30% PCL content had a good flexibility and a half-life of 90 days, which was matched with the clinical requirement of tendon operation, and suited for the preparation of tendon stapler. In cell culture experiments, the number of fibroblast cells in the surface of blend mat of PDLLA/PCL (70/30) were very few, which showed that the cell was not easy adhesion to the surface of the material. The material had good function of preventing adhesion.
  • The study on processing thermal stability of PPc
    ;;Long OuYang;Yue-Jun LIU
    . 2015, 46(15-高分子): 23-0.
    Abstract ( ) Knowledge map Save
    Degradable Poly (propylene carbonate) (PPC) plastic generally has poor processing thermal stability. High pressure capillary rheometer, FTIR, TG, tensile machine and color difference meter were used to evaluate PPC’s processing thermal stability. The results show that PPC’s processing thermal stability can be evaluated successfully by high pressure capillary rheometer. TG can be used for evaluation but it has bad sensitivity for different processing conditions or different formulations of PPC. The other methods are not suitable for evaluating this material. The research can give instructive effect on the process and thermal stability research of PPC in the future.
  • Preparation of the PMMA/EG Composite by in-situ Expansion and its Electrical and Rheologieal Properties
    ;;
    . 2015, 46(15-高分子): 24-0.
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    PMMA/EG composite was prepared through the method of “in-situ expansion-mechanical exfoliation” and the influence of low-temperature expandable graphite (LTEG) content on its electrical property was investigated in this paper. Electrical conductivity, SEM and dynamic rheology analysis indicated that the layers of expanded graphite were well dispersed in resin matrix; when the composite containing 10 phr -20 phr EG, graphite flakes were contacted mutually and formed the conductive network gradually, which increased electrical conductivity obviously (up to a maximum of 1012 ). The method of filling PMMA with LTEG can obtain low threshold value of seepage composite and improve electrical conductivity sufficiently at a low content of LTEG.
  • Synthesis and characterization of PNIPAM-Co-HEAC nanoparticles
    . 2015, 46(15-高分子): 25-0.
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    Abstract: In this work, the N-Isopropylacrylamide (NIPAM) and Hydroxylethylacrylate (HEAC) were used as the starting material; N, N’-methylenebisacry-lamide (BIS) was selected as the cross-linking agent; Sodium lauryl sulfonate (SDS) was selected as surfactant. By applying different proportion, emulsion polymerization method was used to prepare P(NIPAM-Co-HEAC) nanoparticles with different particle sizes. Based on these nanoparticles, electrophoretic deposition method was further used to fabricate the structurally colored fiber. FE-SEM and Fourier infrared spectrometer were used to characterize the morphology and structure of the as-prepared P(NIPAM-Co-HEAC), respectively. The optical fiber spectrometer and optical microscope were adopted to characterize the structurally colored fiber.
  • The effect of transforming end-group on the non-isothermal crystallization kinetics of Methoxy PolyEthylene Glycol
    si-yang MU
    . 2015, 46(15-高分子): 26-0.
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    Mono polyethylene glycol maleate(MPEGMA) was synthesized by esterification of malefic anhydride and Methoxy polyethylene glycols(MPEG).The crystal morphology of Methoxy PolyEthylene Glycol and Mono Polyethylene Glycol maleate were studied using POM, the results shows that there is cross extinction phenommenon both in MPEG and MPEGMA, but there is a difference in the crystalline form. The non-isothermal crystallization kinetics of MPEG and MPEGMA was investigated by DSC, and described by Jeziorny and Mo, the studies shows that with the increase of cooling rate, the crystallization rate of the two materials are increased. After transforming end-group by esterification between MPEG and MA, the original molecular motion of MPEG was inhibited, which lead to the crrystallization rate of therminal group conversion products-MPEGMA decreased, making differences in nucleation model and growth mechanism of crystallization for MPEGMA and MPEG.
  • Preparation of wet-driven shape memory fabrics based on polyethylene glycol and its’ properties
    . 2015, 46(15-高分子): 27-0.
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    Wet-driven shape memory fabrics were prepared with polyethylene glycol (PEG1500), polyhydric alcohol etherified 2D resin(LF-2)and MgCl2?6H2O. The wet-driven shape memory effect was measured by shrinkage rate in wet state and shrinkage recovery rate in dry state. The morphology and FT-IR spectrum of wet-driven shape memory fabrics were characterized by scanning electron microscope and FT-IR spectrograph and the mechanism of wet-driven shape memory effect was analyzed. The results show that -C-O-C- chemical cross-linking was formed between PEG1500, fibers and resin. In wet-dry cycles，the shrinkage rate of fabrics in wet state is up to 12% and the shrinkage recovery rate of fabrics in dry state is up to 80%. The elasticity and the formaldehyde content of the fabrics were decreased, while the pilling resistance and hygroscopic properties were significantly improved.
  • Effect of Hydrazine Monomers on the Curing Kinetics and Degradation Kinetics of Polyurethane-Polyacrylate Latex Films
    ;
    . 2015, 46(15-高分子): 28-0.
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    Abstract: The waterborne polyurethane-acrylate emulsions were prepared by in-situ polymerization and modified by ketone hydrazine crosslinking reaction, using methyl methacrylate acetoxy (AAEM) as ketone monomer, adipic dihydrazide, carbodihydrazide, oxalylhydrazide and succinohydrazide as hydrazine monomers. Effects of hydrazine monomers on the curing kinetics and degradation kinetics of polyurethane-polyacrylate latex films were studied by non-isothermal differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). The temperatures of the curing process were obtained by T-β extrapolation method, the curing reaction activation energy, reaction order and frequency factor were calculated by Kissinger-Ozawa and Crane equation, and the thermal degradation kinetics of latex films were analyzed by Kissinger method. The results showed that the apparent activation energy of latex film with oxalylhydrazide was the highest, which was 3.153 kJ / mol, the reaction order was 1.148 and the frequency factor is 57.943. While the apparent activation energy of latex film with carbodihydrazide is the lowest, which was 1.639 kJ / mol, the reaction order was 1.317 and the frequency factor was1.917. In addition, the polyurethane-acrylate latex film with carbodihydrazide exhibited the highest thermal stability, while with adipic dihydrazide showed the poor thermal stability.
  • Degradation Behavior and Oxidation Products analysis for High Density Polyethylene During Lasa Tibet Natural Aging
    Jun-Jun GUO; ;Zhi-De HU;
    . 2015, 46(15-高分子): 29-0.
    Abstract ( ) Knowledge map Save
    In order to study the aging profile of high density polyethylene (HDPE) used as rotational packaging case under the extreme conditions, the nature exposure test was carried out for 18 months in Lasa Tibet. The structural changes of carbonyl index, hydroxyl index, branching degree, chain scission degree , unsaturation degree and crystal structure were monitored, by attenuated total reflection infrared spectroscopy (ATR-FTIR) and X-ray diffraction, to determine the degradation behavior. Finally, the character peaks of oxidation products were analyzed by Lorentz distribution technology. The results showed that the chain branching & oxidation play a leading role in the early aging progress. Then the chain branching & chain breaking gradually takes place in the interim aging progress with a slow oxidation progress. The chain breaking is predominant in the later aging progress. The crystalline structure is basically unchanged after aging, but the cell parameters are weakly changed. The ketone is the primary oxidation product, with opposite generate trend to the secondary oxidation product, γlactone. The oxidation products of aldehyde and ester increase slowly in the early aging progress, then rapidly.
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