【作者】 徐勇； 叶胜荣； 钱锦文；

【Author】 Xu Yong, Ye Shengrong, Qian Jinwen Institute of Polymer Science, Zhejiang University, Hangzhou, 310027

【机构】 浙江大学高分子科学研究所；

【摘要】 <正> 聚对苯二甲酸丙二醇酯(PTT)是近几年发展起来的一种新型热塑性聚酯,尽管目前对于PTT均聚物热行为的研究在不断增加,但对其共聚酯合成及热行为方面的研究仍然较少。和聚对苯二甲酸乙二醇酯(PET)及聚对苯二甲酸丁二醇酯(PBT)一样,共聚酯热行为的研究对于PTT这样一种典型的半结晶型聚酯来说有着重要的理论和应用价值。本文合成了各种组分的聚对苯二甲酸丙二醇酯/聚对苯二甲酸乙二醇酯共聚物。通过特性粘度的测量以及高分辨核磁表征了其分子结构和组成。利用广角X射线衍射(WAXD)和差示扫描量热(DSC)分析了其结晶、熔融和玻璃化转变的组成依赖性。更多还原

【Abstract】 Poly (trimethylene-co-ethylene terephthalate) with various compositions has been synthesized. The crystallization of copolyesters with high comonomer content was observed by both Wide-angle X-ray diffraction (WAXD) and Differential scanning calorimetry (DSC). It was found that the copolyesters become less crystallizable with the involvement of the comonomer, the crystals of crystallizable copolyesters come from PTT or PET homopolymers.The glass transition temperature (Tg) of the copolyester increases with increasing PET component in the copolyester, and the relationship between Tg and composition obey both Fox equation and additive law, the former is better in describing this relationship.更多还原