Isothermal Crystallization Behavior of Biodegradable Poly (butylene succinate-co-terephthalate) (PBST) Copolyesters at High Undercoolings  

作　　者：许新建 李发学 罗胜利 俞建勇 

机构地区：[1]College of Textiles,Donghua University

出　　处：《Journal of Donghua University(English Edition)》2008年第4期405-407,共3页东华大学学报（英文版）

摘　　要：Poly （butylene succinatc-co-terephthalate） （PBST） copolycsters were prepared by polycondensation. The crystallization behavior of the as-prepared copolyesters was investigated by depolarized light intensity （DLI） at high undercoolings. According to Avrami equation, the exponent n, independent of the crystallization temperature, is at a range of 2. 5 to 3. 4, which probably corresponds to the heterogeneous mucleation and a 3-dimensional spherulitic growth. The maximum crystallization rate, very useful to polymer processing, was found at about 90℃ based on the half-crystallization time t1/2 analysis.Poly(butylene succinate-co-terephthalate)(PBST)copolyesters were prepared by polycondensation.The isothermal crystallization behavior of the as-prepared copolyesters was investigated by depolarized light intensity(DLI)at high undercoolings.According to Avrami equation,the exponent n,independent of the crystallization temperature,is at a range of 2.5 to 3.4,which probably corresponds to the heterogeneous nucleation and a 3-dimensional spherulitic growth.The maximum crystallization rate,very useful to polymer processing,was found at about 90℃ based on the half-crystallization time t1/2analysis.

关 键 词：PBST copol yesters DLI isothermal crystallization high undercoolings 

分 类 号：TQ342.29[化学工程—化纤工业]