以对苯二甲酸二甲酯(DMT)、1,4-丁二醇和生物质来源的衣康酸二甲酯(DI)为原料,采用熔融缩聚法制备了一类生物可降解脂肪族/芳香族共聚酯-聚(对苯二甲酸丁二醇酯-co-衣康酸丁二醇酯)(PBTI),并考察了缩聚反应时间、缩聚温度和DMT与 DI 的物质的量比对 PBTI 相对分子质量和热力学性质的影响。利用1 H-NMR和 FT-IR对PBTI的结构进行了确认,同时 GPC、DSC和TGA测试结果表明,相对分子质量、玻璃化转变温度和熔点都受共聚酯中DMT与DI比例的影响。另外还探究了DMT与DI的物质的量比对该类共聚酯降解性的影响,结果表明,随脂肪族链段的增加共聚酯的降解性逐渐增加。%A series of biodegradable aliphatic/aromatic copolyesters-poly(butylene terephthalate-co-butylene itaconate)(PBTI) were synthesized by melt polycondensation using dimethyl terephthalate (DMT),1,4-butanediol(BD)and dimethyl itaconate (DI)as raw materials.The effects of polymerization time,temperature,as well as aliphatic/aromatic mole ratio on physical and thermal properties of the copolyesters were investigated.The structure of the copolyesters was studied by 1 H-NMR and FT-IR.DSC,TGA and GPC analysis clearly indicated that the molecular weight,glass-transition temperature and melting point were influenced by the ratio between DMT and DI in the final copolyesters.In addition,the effect of mole ratio between DMT and DI on the degradability of the copolyesters was studied.Results showed that the degradability of the copolyesters was gradually improved with the increase of the aliphatic units in the chain.
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