摘要
用差示扫描量热法(DSC)、核磁共振技术(NMR)以及红外光谱等方法对经共缩聚而制得的PET-PBT共聚酯进行了结构和性能分析。PET-PBT共聚酯为嵌段共聚物,两种链段的非晶区是相溶的,只观察到1个玻璃化转变温度Tg,而它们的晶相是分离的。随着PET-PBT共聚酯中PBT链段含量提高,共聚结晶熔点不断下降,Tg也有下降趋势。PBT链段的引入增强了PET分子链段的柔顺性,有利于提高PET链段的结晶能力。另一方面,少量PBT链段的引入,也破坏了PET分子链的规整性,不利于其结晶。由于这两方面的原因,在低PBT链段含量时,PET-PBT共聚酯的结晶能力改善并不十分明显。
A lot of modern detection technology have been utilized to investigate the structure and properties of PET PBT copolyester, which was synthesised through condensation polymerization between PBT oligomer and PET oligomer. The results indicated that PET PBT copolyester is block copolymer. Only one glass transition temperature T g can be found, which showed the miscibility of PBT and PET segments in amorphous phase but they crystallized separately acording to its own cell. With increasing the PBT segments content in PET PBT copolyester, the melting point and T g depress. The introduction of PBT segments in the copolyester is favorable for PET crystallization. In another view, the introduction of PBT segment in the copolyester decreased the regularity of PET, which is unfavorable for PET crystallization. When PBT content is low in the PET PBT copolyester, the improvement of PET PBT crystllization ability is weak.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1996年第5期102-110,共9页
Polymer Materials Science & Engineering
关键词
PET
PBT
共聚酯
玻璃化
结晶
饱和聚酯
PET PBT copolyester, block copolymer, glass transition temperature, crystallization, melting, miscibility