脲变性大豆蛋白塑料的性能和结构研究  

Study on Properties and Structure of Urea Denaturation Soy Protein Plastics

作　　者：邹文中[1] 温其标[2] 杨晓泉[2] 

机构地区：[1]北海职业学院,广西北海536000 [2]华南理工大学,广东广州510640

出　　处：《塑料科技》2013年第10期78-82,共5页Plastics Science and Technology

基　　金：广西自然科学基金(桂科自0991268)

摘　　要：将脲作为变性剂添加到大豆蛋白中,制备了脲变性大豆蛋白塑料,并研究了该变性大豆蛋白塑料的力学性能、动态力学性能、吸水性能、热稳定性以及微观结构和形貌。结果表明:当脲含量为27.0%时,该变性大豆蛋白塑料具有最大的断裂伸长率和断裂能,其玻璃化转变温度比非变性大豆蛋白塑料低98.3℃;随着脲含量的增加,材料的2 h吸水率和24 h吸水率均有所降低,其耐水性明显得到改善;当脲含量为9.0%时,同非变性大豆蛋白塑料相比,变性大豆蛋白塑料的热稳定性下降,而且其热失重曲线中最大失重速率所对应的温度高于脲的分解温度;红外光谱和扫描电镜结果表明,由于大豆蛋白与脲之间的氢键作用,使大豆蛋白之间的氢键被破坏,进而改善了大豆蛋白塑料的韧性。Urea denatured soy protein plastics were prepared with urea as modifier. The mechanical properties, dynamic mechanical properties, water absorption, thermal stability, structure and morphology of the modified soy protein plastics were investigated. The results show that the soy protein plastics containing 27.0% urea has the maximum elongation at break and fracture energy, and glass transition temperature of the plastics is 98.3℃ lower than that of unmodified soy protein plastics. Water absorption of the urea denatured plastics decreases with the increasing content of urea. The decomposition temperature of urea is much lower than the corresponding temperature of maximum mass loss rate in plastics with 9.0% urea. The results of FTIR and SEM show that urea could form the hydrogen bonds with soy proteins, which improves the flexibility of urea denatured soy protein plastics.

关 键 词：大豆蛋白 脲 塑料 变性 

分 类 号：TQ321.4[化学工程—合成树脂塑料工业]