海泡石增强壳聚糖/玉米醇溶蛋白复合膜的制备及性能

Preparation and Properties of Chitosan/Zein Composite Films Enhanced by Sepiolite

采用流延成膜法制备了不同海泡石(SP)质量分数的壳聚糖(CS)/玉米蛋白(ZN)复合膜。研究了SP质量分数对CS/ZN复合膜机械性能和断面形貌的影响,分析了SP对CS/ZN复合膜的增强机理。扫描电子显微镜结果表明,SP粒子在复合膜中分散较好,CS与ZN之间有较好的相容性。随着SP质量分数增加,SP/CS/ZN膜拉伸强度先增加后减小,当SP质量分数为2%时,其拉伸强度达到最大值21.1 MPa,比纯CS/ZN提高了8.1%;而断裂伸长率随着SP质量分数先增加后降低,从15.3%下降为7.5%;同时复合膜的耐水性能上升,复合膜的吸水率随着SP质量分数增加先减小后增加,在8%时达到最小值。SP的引入导致复合膜的透光性能下降,SP质量分数为6%时在波长800 nm处光透过率下降约20%。

Organic/inorganic nanocomposite films were prepared by the solution casting method by introducing sepiolite（SP） into chitosan（CS）/zein（ZN） matrix.The effects of SP addition on the mechanical properties and water-resistance were investigated.And the enhancement mechanism of SP loading in the matrix was also analyzed.The results revealed that the nanocomposite films have better miscibility,which resulted in the improved mechanical properties and water-resistance compared with the pure CS/ZN film.And it indicated that SP dispersed well in the CS matrix.The tensile strength increased with the increase of SP loading.When the content of SP loading was 2%,the tensile strength reached the highest value of 21.1 MPa,which was increased about 8.1% comparing with pure CS/ZN.Meanwhile,the elongation at break of nanocomposites decreased from 15.3% to 7.5% with the SP loading increasing from 0 to 10%.The water uptake value of nanocomposite decreased and then increased with the increase in SP loading.And the minimum value was obtained when the SP loading was 8%.Furthermore,the light transmittance of the films decreased about 20% with the introduction of6% SP in the visible light regions of 800 nm.