PBS基共聚酯P(BS-co-PeD)和P(BS-co-GA)的降解差异性研究

摘要

A novel series of PBS-based copolyester was successfully synthesized by melt poly-condensation,that is,poly(butylene succinate-co-pentanediol succinate)P(BS-co-PeD)and poly(butylene succinate-co-butylene glutaric acid)(PBS-co-GA).The thermal properties and crystallinity were analyzed by thermogravimetric analyzer(TGA),differential scanning calo-rimetry(DSC)and wide angle X-ray diffraction(WAXD).In the aqueous system,Candida antarctica lipase B was used as the enzyme catalyst to study the different degradability of P (BS-co-PeD)and(PBS-co-GA).T he results show that both copolyesters have excellent ther-mal stability,the decomposition temperature are above 300 ℃,however the crystallinity and the glass transition temperature(Tg)decrease,meanwhile,(PBS-co-30PeD)and(PBS-co-30GA)can achieve complete degradation after 24 h,the mass loss rates of(PBS-co-20PeD) and(PBS-co-20GA)are 85% and 93% respectively in 5 days,illustrating that(PBS-co-GA) has better degradation than(PBS-co-PeD).%通过熔融缩聚法合成了 PBS 基共聚酯,即聚(丁二酸丁二醇-co-丁二酸戊二醇酯) (PBS-co-PeD)和聚(丁二酸丁二醇-co-戊二酸丁二醇酯)(PBS-co-GA).其热性能,结晶性能采用热重分析仪(TGA),示差扫描量热仪(DSC)和广角X射线衍射光谱仪(WAXD)测试.以南极假丝酵母脂肪酶B(Candida antarctica lipase B,CALB)为酶催化剂,在水相体系中研究了(PBS-co-PeD)和(PBS-co-GA)的降解差异性.研究结果表明,两种共聚酯的热稳定性优良,热分解温度均在300 ℃以上,但结晶度和玻璃化转变温度(Tg)均下降,24 h后(PBS-co-30PeD)和(PBS-co-30GA)均可达到完全降解,5 d后(PBS-co-20PeD)和(PBS-co-20GA)的质量损失率分别为85% 和93%,表明(PBS-co-GA)的降解性能优于(PBS-co-PeD).