十二烷基硫酸钠改性埃洛石纳米管-菜籽蛋白复合膜的性能研究

Study on property of lauryl sodium sulfate modified halloysite nanotubes-rapeseed protein blend film

以十二烷基硫酸钠改性埃洛石纳米管制备改性埃洛石纳米管,并以其为填料,菜籽蛋白为基体制备改性菜籽蛋白膜。对改性膜的机械性能研究的结果表明,最佳的改性埃洛石纳米管用量为3%,添加改性埃洛石纳米管后的菜籽蛋白膜抗拉强度提高约为20%,断裂伸长率为20%。热重测试结果表明,改性后薄膜在506℃增加了一个由与埃洛石结合菜籽蛋白燃烧产生的失重峰,由DSC曲线可以得出改性薄膜的蛋白质放热峰向低温段移动16℃,说明改性膜的热稳定性略有降低。红外测试表明十二烷基硫酸钠是通过物理吸附的方式改性埃洛石纳米管的。菜籽蛋白部分与埃洛石纳米管交联,增强了蛋白质分子与埃洛石之间的界面结合强度。

Modified halloysite nanotubes was fabricated by using lauryl sodium sulfate and halloysite. And the modified rapeseed protein film was prepared by using the rapeseed protein as matrix and the modified halloysite nanotubes as filler. The results of the film＇s mechanical properties showed that the optimum addition of the modified halloysite nanotubes was 3% ,the tensile strength of the film improved by 20% approximately, and the elongation at break was 20%. The results of the TG tests showed that the modified film appeared a new weight loss peak at 506℃ caused by burn of the rapeseed protein which combined with the halloysite nanotubes. It could be conclude from the DSC curves that the heat release peaks of the modified film shifted 16℃ to the low temperature,which illustrated the film＇s heat endurance had a slight decrease. The FTIR tests of the film showed that the lauryl sodium sulfate modified the halloysite by physical absorption. Rapeseed protein partly cross linked with the halloysite nanotubes and strength the interfacial strength between rapeseed protein and hallosite nanotubes.