大豆分离蛋白/二氧化硅改性水性聚氨酯膜性能的研究

采用溶胶-凝胶法制备了大豆分离蛋白/二氧化硅杂化溶胶,并应用于水性聚氨酯的改性.采用流延法制备大豆分离蛋白/二氧化硅/水性聚氨酯共混膜,红外光谱研究表明大豆分离蛋白、二氧化硅和水性聚氨酯间发生了多层次的氢键作用,以膜的拉伸强度、断裂伸长率和溶失率为指标,研究了各组分混配比例对共混膜力学性能及耐溶剂性能的影响.通过接触角、热重分析、扫描电镜和原子力显微镜分析讨论了共混膜的亲水亲油性、耐热性能,以及膜表面的形态形貌.结果表明,大豆分离蛋白/二氧化硅添加量为6％（质量分数）、两者之间质量比为1∶1时,改性膜的力学性能最优,耐溶剂性随添加量增加而改善.

Film-forming Properties of Waterborne Polyurethane Film Modified by Soy Protein Isolate/Silica

Soy protein isolate/silica hybrid sol was prepared by a sol-gel method and applied to modification of waterborne polyurethane.Soy protein isolate/silica/waterborne polyurethane blend films were prepared by tape casting.Infrared spectroscopy studies showed that the multi-level hydrogen bonds occurred between the soy protein isolate,silicon dioxide,and waterborne polyurethane.Effects of mixed proportion of each component on mechanical properties and solvent resistance of the blend membrane were studied by the tensile strength,the elongation at break and the dissolved loss rate of the membranes as indexes.The amphipathic property,heat resistance,and surface topography and morphology of the modified waterborne polyurethane film were discussed by contact angle measurements,thermal gravimetric analysis,scanning electron microscopy,and atomic force microscopy.The results showed that,at the room temperature,when isolated soy protein/silica was added in an amount of 6％ and proportion of them as 1 ∶ 1,the mechanical properties of the modified film were optimal,and the solvent resistance was improved with the increasing amount.