【作者】 张竞； 梁滨； 臧蕊； 张法忠；

【Author】 Jing Zhang;Bin Liang;Rui Zang;Fazhong Zhang;Beijing Key Laboratory of Packaging and Printing New Technology,China Academy of Printing Technology;Key Laboratory of Printing Environmental Protection Technology,China Academy of Printing Technology;Beijing Xinghang Electro—mechanical Equipment Co,Ltd;College of Food Science and Technology,Agricultural University of Hebei;

【机构】 中国印刷科学技术研究院包装印刷新技术北京市重点实验室； 中国印刷科学技术研究院印刷环保技术重点实验室； 北京星航机电装备有限公司； 河北农业大学食品科技学院；

【摘要】 P(3HB-co一4HB)作为一种能够完全降解的、具有良好生物相容性与环境友好型的热塑性高分子材料,引起了很多学者的广泛研究。本实验对5种4HB摩尔含量的P(3HB-co-4HB)在含有脂肪酶的磷酸缓冲液中的生物降解性能进行了研究,分析了降解机理和降解影响因素。通过质量变化、分子量变化、膜表面形态表征了其生物降解性能。结果表明,4HB含量对脂肪酶降解过程的影响较小;酶解过程中5种P(3HB-co-4HB)质量损失速率和分子量降低程度相差不大;P(3HB-co-15%4HB)具有较低的结晶度和较好的表面粗糙度,从而降解速率最快。SEM图像表明脂肪酶对于P(3HB-co-4HB)具有较快的降解能力,其酶降解过程是一个表面腐蚀的过程。更多还原

【Abstract】 As a kind of fully biodegradable,biocompatible and environment friendly thermoplastic polymer materials,more and more scholars began to study the P(3HB-co-4HB).In this paper,five kinds of 4HB molar fraction of P(3HB-co-4HB) biodegradability in phosphate buffer containing lipase were studied in the analysis of the degradation mechanism and degradation factors.Characterization of biodegradable performance was characterized by weight loss,molecular weight change,membrane surface morphology.The results showed that 4HB molar fraction has little effect on the enzymatic degradation.During the five kinds of P(3HB-co-4HB),the weight loss rate and molecular weight changes httle.P(3HB-co-15%4HB)has a lower degree of crystallinity and good surface roughness,so the degradation rate is the best of all.SEM image indicated that lipase for P(3HB-CO-4HB) has a faster degradation,and its enzymatic degradation process is a surface corrosion process.更多还原