Li Yi-Dong, Zeng Jian-Bing, Wang Xiu-Li, Yang Ke-Ke, Wang Yu-Zhong
Center for Degradable and Flame-Retardant Polymeric Materials, Key Laboratory of Green Chemistry and Technology (MoE), College of Chemistry, Sichuan University, Chengdu 610064, China.
Biomacromolecules. 2008 Nov;9(11):3157-64. doi: 10.1021/bm800745p. Epub 2008 Oct 21.
A novel environmentally friendly thermoplastic soy protein/polyester blend was successfully prepared by blending soy protein isolate (SPI) with poly(butylene succinate) (PBS). To improve the compatibility between SPI and PBS, the polyester was pretreated by introducing different amounts of urethane and isocyanate groups before blending. The blends containing pretreated PBS showed much finer phase structures because of good dispersion of polyester in protein. Consequently, the tensile strength and modulus of blends increased obviously. A lower glass transition temperature of protein in the blends than that of the pure SPI, which was caused by the improvement of the compatibility between two phases, was observed by dynamic mechanical analyzer (DMA). The hydrophobicity, water resistance, and moisture absorption at different humidities of the blends were modified significantly due to the incorporation of PBS.
通过将大豆分离蛋白（SPI）与聚丁二酸丁二醇酯（PBS）共混，成功制备了一种新型环保热塑性大豆蛋白/聚酯共混物。为了提高SPI与PBS之间的相容性，在共混前对聚酯进行预处理，引入不同量的氨基甲酸酯和异氰酸酯基团。由于聚酯在蛋白质中的良好分散，含有预处理PBS的共混物呈现出更精细的相结构。因此，共混物的拉伸强度和模量明显提高。动态力学分析仪（DMA）观察到，由于两相之间相容性的改善，共混物中蛋白质的玻璃化转变温度低于纯SPI的玻璃化转变温度。由于PBS的加入，共混物的疏水性、耐水性和在不同湿度下的吸湿率都有显著改变。
