不同酶对PBS基共聚酯/淀粉复合材料降解性能的影响  

Effects of Different Enzymes on Degradation of PBS-based Copolymer/Starch Composite

作　　者：苗妮娜 张敏[1] 张璐[1] 王蕾[1] 邱建辉 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,西安710021 [2]日本秋田县立大学

出　　处：《工程塑料应用》2016年第3期84-89,共6页Engineering Plastics Application

基　　金：陕西省自然科学基础研究计划项目(2015JM2069);陕西科技大学科研启动基金项目(BJ09-08)

摘　　要：采用L9（33） 正交试验对α– 淀粉酶降解聚丁二酸丁二酯（PBS） 基共聚酯/热塑性淀粉（TPS） 复合材料的条件进行了优化,得出α– 淀粉酶的最优降解条件为：温度65℃,磷酸盐缓冲液pH=6.8,α– 淀粉酶浓度3.5 g/L.利用α– 淀粉酶和南极假丝酵母脂肪酶N435 对PBS/TPS、聚（ 丁二酸丁二醇-co- 丁二酸二甘醇） 酯（PBS-co-DEG）/TPS、聚（ 丁二酸丁二醇-co- 丁二酸乙二醇-co- 丁二酸聚乙二醇200） 酯（PBES-co-PEG200）/TPS、聚（ 丁二酸丁二醇-co- 丁二酸乙二醇-co- 丁二酸聚乙二醇400） 酯（PBES-co-PEG400）/TPS 复合材料分别进行降解实验,研究了两种酶对这4 种复合材料降解性能的影响.结果表明,α– 淀粉酶和N435 脂肪酶对复合材料均有较好的降解能力,当降解时间较短（6 h） 时,α– 淀粉酶对复合材料的降解效果优于脂肪酶N435,但当降解时间超过60 h 后,后者的降解效果略优于前者;（PBES-co-PEG200）/TPS 和（PBES-co-PEG400）/TPS 复合材料的降解性能总体上优于（PBS-co-DEG）/TPS 及PBS/TPS 复合材料;随PEG200 和PEG400 在共聚酯中的含量增加,即醚链含量的增加,相应复合材料的质量损失率呈升高趋势,但当醚链含量较高时,复合材料的质量损失率反而有所下降.L9(33) orthogonal test was adopted to optimize the degradation conditions ofα–amylase for PBS-based copolymer/thermoplastic starch (TPS) composites,then the optimal conditions were obtained,the temperature is 65℃,pH of phosphate buf-fer is 6.8 and concentration ofα–amylase is 3.5 g/L.α–amylase and Lipase Novozym435 were used to degrade the composites of PBS/TPS,(PBS-co-DEG)/TPS,(PBES-co-PEG200)/TPS and (PBES-co-PEG400)/TPS,the effects of the two enzymes on degradation properties of these composites were studied. The results show that bothα–amylase and Lipase Novozym435 have better degradation capability on these composites,when the degradation time is shorter (6 h),the degrading effect ofα–amylase is better than that of Lipase Novozym435,but when the degradation time is over 60 h,the degrading effect of the latter is slightly better than that of the former. The degradation properties of (PBES-co-PEG200)/TPS and (PBES-co-PEG400)/TPS composites are better than those of (PBS-co-DEG)/TPS and PBS/TPS composites in total. With the increase of PEG200 or PEG400 content in PBS-based co-polymer,i.e.,with the increase of ether chain content,the mass loss rates of the composites show increasing tendency,but when the ether chain content is too high,the mass loss rates of the composites decrease instead.

关 键 词：聚丁二酸丁二酯 淀粉 正交试验 α–淀粉酶 南极假丝酵母脂肪酶N435 降解 

分 类 号：TQ31[化学工程—高聚物工业]