壳聚糖/明胶/TiO2三元复合膜的制备与功能特性

纳米TiO2用阴离子表面改性剂SDS改性后，以溶液共混法制备了壳聚糖／明胶/TiO2复合膜，用FTIR、XRD、SEM、TEM表征了其结构与形态，并测试了其吸水率、透光率、力学性能和抑菌性能。进而探讨了复合膜中明胶和纳米TiO2含量对壳聚糖膜性能的影响。结果表明：复合膜中，壳聚糖、明胶和TiO2微粒间存在强烈的氢键相互作用，从而使明胶与壳聚糖具有良好的相容性，TiO2与壳聚糖、明胶分子间有很好的界面作用。适量TiO2的加入，可使壳聚糖／明胶共混膜的力学性能得到改善，明胶质量分数为0．30时，掺杂wTiO2为0．01、0．02的复合膜较壳聚糖／明胶共混膜的湿强及干态韧性分别提高了55．9％，40．8％和49．7％，47．9％。此外，复合膜的抑菌性能随明胶的增加而降低，但随TiO2的掺杂比的增加而增强，纳米TiO2的引入拓宽了壳聚糖和明胶两种天然高分子材料的应用范围。

Preparation and Properties of Chitosan/Gelatin/Nano-TiO2 Ternary Composite Films

Nano-titanium particles was treated with anionic surfactant detergent SDS to prepare Cs/Gelatin/nano-titanium dioxide composite films by solution method, the films obtained were characterized by FTIR,XRD,SEM,TEM,optical trasmittance,percent water absorption, the measurements of mechanical properties and antibacterial activity.It was found that there was hydrogen bonding interactions between chitosan , gelatin molecules and titanium dioxide nanoparticles.To induce gelatin into the films can increase their tensile strength in dry state and breaking elongation in wet state but decrease the tensile strength in wet state and breaking elongation in dry state.The proper content of titanium dioxide nanoparticles can make up for the defectant above .and also find that the antibacterial activity of conposite films decreases with increasing gelatin content but increases with nano-titanium particles increasing content.