The Relationship Between The Change Of Carboxyl Monomer Content And The Properties Of Aliphatic Polyester

Poly（butylene succinate）（PBS）is an environmentally friendly polymer obtained by copolymerization of succinic acid and butylene glycol,which is biodegradable and processable.The synthetic methods,production and development technologies are becoming more and more perfect,and have been gradually applied to textiles,packaging,agricultural materials and other aspects.In this study,the adding of different carbon chains or different content of carboxyl monomers aims to improve the defects of high crystallinity and poor degradation performance of PBS,and then broaden its application fields.In this work,isopropyl titanate was used as a catalyst,1,4-butanediol and different carboxyl monomers（succinic acid,adipic acid,and suberic acid）were used as raw materials to copolymerize into a series of PBS-based aliphatic polyesters,with different carboxyl monomers contents.Then,the polyesters were used to characterize and analyze the chemical structure,thermal properties,and crystal structure of the polyester synthesized and degraded by cutinase.the result showed as follows:（1）The [Poly（butylene succinate-co-butylene adipate）,P（BS-co-BA）],with good thermal stability and mechanical properties was synthetized as the expectations.The cutinase degradation results showed that after degradation20 h,the degradation rate of polyester exceeded 92%.It showed,the biodegradability of P（BS-co-BA）was excellent.It was also found that the crystallinity and melting point of P（BS-co-BA）are important factors affecting its degradation.（2）Compared with homopolyester PBS or PBSub,the crystallinity of all Poly（butylene succinate-co-butylene suberate）,P（BS-co-BSub）] were reduced.The degradation rate of polyesters by cutinase werre as follows: PBS