Crystallization Behavior of Copolymer Poly(ethylene terephth-alate/isophthalate)(IPET)  

作　　者：顾书英 肖茹 顾利霞 

机构地区：[1]Department of Polymer Materials Science, Tongji University, Shanghai, 200092 [2]College of Materials Science & Engineering, Dong Hua University, Shanghai, 200051

出　　处：《Journal of Donghua University(English Edition)》2001年第1期1-5,共5页东华大学学报（英文版）

摘　　要：The non-isothermal crystallization kinetics, isothermal crystallization and the morphology of crystals of the copolymer poly (ethylene terephthalate/ isophthalate )(IPET) were studied by DSC and polarized-light microscopy in this paper. DSC results indicate that the glass transition temperature Tg of IPET is slightly lower than that of poly(ethylene terephthalate) (PET), but the melting temperature Tm and the crystallization temperature Tc of PET and IPET have much difference.The difference of Tc between PET and IPET2 is about 7℃, and the difference of Tm between PET and IPET2 is about 16℃. From the kinetics analysis of the crystallization, the crystallization mechanism of all samples is of three-dimension spherulitic growth from instantaneous nuclei and the incorporation of isophthalate (IPA) decreases the crystallization rate of IPET greatly. The isothermal results indicate that the morphologies of PET and IPET crystals are all spherulite, which is in conformity to the results of nonisothermal dynamic crystallization. At the same time,the spherulite of IPET grows slower and has longer incubation time than the spherulite of PET under the same crystallization condition.The non-isothermal crystallization kinetics, isothermal crystallization and the morphology of crystals of the copolymer poly ( ethylene terephthalate/ isophthalate ) (IPET) were studied by DSC and polarized-light microscopy in this paper. DSC results indicate that the glass transition temperature T8 of IPET is slightly lower than that of poly (ethylene terephthalate) (PET), but the melting temperature Tm and the crystallization temperature Tc of PET and IPET have much difference. The difference of Tc between PET and IPET2 is about 7℃, and the difference of Tm between PET and IPET2 is about 16℃. From the kinetics analysis of the crystallization, the crystallization mechanism of all samples is of three-dimension spherulitic growth from instantaneous nuclei and the incorporation of isophthalate (IPA) decreases the crystallization rate of IPET greatly. The isothermal results indicate that the morphologies of PET and IPET crystals are all spherulite, which is in conformity to the results of non-isothermal dynamic crystallization. At the same time, the spherulite of IPET grows slower and has longer incubation time than the spherulite of PET under the same crystallization condition.

关 键 词：non-isothermal CRYSTALLIZATION kineties   isothermal crystallization  POLY ( ETHYLENE TEREPHTHALATE / ISOPHTHALATE ) morphology. 

分 类 号：TS1[轻工技术与工程—纺织科学与工程]