;
. 2010, 41(07): 36-0.
Abstract (
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The unmodified nano-SiO2 and organic modified nano-SiO2 (5wt% SiO2) which was treated with KH550, KH560, KH570 and KH8431 were used to prepare EVOH /SiO2 nano-composites, and the composites were blown to film later. Nano-SiO2 treated by different silane coupling agents were characterized and analyzed by FT-IR and TEM, and the structure of the composites was analyzed by SEM. The rheological behaviors, mechanical properties, barrier properties, thermal properties and transparency of the composites were characterized too. The results show that: chemical bonds were formed between nano-SiO2 and the four silane coupling agents, and the organic modified nano-SiO2 had a better dispersion and processability than unmodified nano-SiO2 in the EVOH. In contrast, nano-SiO2 treated with KH550 had the best dispersion and interaction force with EVOH. Compared to the composites prepared by unmodified nano-SiO2, the tensile strength and storage modulus of the composites prepared by organic modified nano-SiO2 increased by 17.2% and 136%, and the moisture permeance factor and oxygen permeability coefficient decreased by 11.2% and 9.5% respectively, and the light transmission rate was 74.9%, fog degree was 14.89%.