Enzymatic Degradation of the Copolyester P(BS-co-DGS)

摘要：

　　Lipase Novozym 435 was used as catalyst to degrade P(BS-co-DGS),which was a kind of PBS-based copolyester modified with diethylene glycol (DEG),in a THF/toluene mixed solvent system.P(BS-co-DGS) copolyesters were synthesized by copolymerization and characterized by 1H NMR.GPC and TGA were used to investigate average molecular weight and thermal property before and after degradation,respectively.After degraded by N435 for 30 h,the Mn of P(BS-co-DGS)10 (DEG content 10%) decreased from 8.33×104 to 3.52×104 g·mol-1 with some yellow oil droplets of oligomers appearing.And the initial decomposition temperature (the temperature at 5% mass loss) of P(BS-co-DGS)10 changed from 300.6℃ to 178.9℃.MALDI-TOF-MS results showed that none of DEG oligomers appeared in P(BS-co-DGS)10 degradation products.However,when the DEG content increased to 20%,there were the DEG circle oligomers as well as linear oligomers in the degradation products.

关键词： Enzymatic degradation P(BS-co-DGS) Circle oligomer Linear oligomer

作者: Ying Zhao Min Zhang Mingming Shang Dan He Jianhui Qiu

作者单位: Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, S Department of Machine Intelligence and Systems Engineering, Akita Prefecture University, Akita 015-0

会议类型: 国际会议

会议名称: the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))

会议地点: 太原

会议语种:英文

页码: 649-654

在线出版日期: 2012-07-13（万方平台首次上网日期，不代表论文的发表时间）