文献类型：期刊文献

中文题名：PET／PEN共混物的结晶与冷结晶性能及其机理

英文题名：Properties and Mechanism of Crystallization and Cold Crystallization of PET/PEN Blends

作者：吴唯[1];毕丽颖[1];陈玉[1];刘明昌[1]

机构：[1]华东理工大学材料科学与工程学院,中德先进材料联合研究中心,上海200237

年份：2013

卷号：29

期号：1

起止页码：67

中文期刊名：高分子材料科学与工程

外文期刊名：Polymer Materials Science & Engineering

收录：CSTPCD;;EI(收录号：20131016090173);Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

语种：中文

中文关键词：聚对苯二甲酸乙二醇酯;聚2;6-萘二甲酸乙二醇酯;共混;结晶;冷结晶;机理

外文关键词：PET; PEN; blend; crystallization; cold crystallization; mechanism

摘要：采用双螺杆熔融挤出法制备了聚对苯二甲酸乙二醇酯(PET)/聚2,6-萘二甲酸乙二醇酯(PEN)共混材料,利用差示扫描量热法(DSC)研究了不同质量比的PET/PEN共混物的熔融与结晶性能。研究结果表明,PET/PEN共混物为部分相容的两相结构。在PET和PEN等质量共混时,可能形成部分相容且彼此交叠的两个连续相。冷却过程中两共混组分既各自形成结晶,又存在一定的共结晶。PET和PEN分子及其链段间互相缠绕和相互作用干扰大分子的结晶过程,导致冷却(降温)过程中结晶不完善和结晶度降低。PET/PEN共混物与PET和PEN一样,具有明显的冷结晶倾向。
Poly（ethylene terephthalate）/poly（ethylene-2,6-naphthalate） （PET/PEN） blends were prepared via a twin-screw melt extrusion in different composions. The melting and crystallization properties of PET/PEN blends were investigated by differential scanning calorimetry （DSC）. It is found that the two-phase structure PET/PEN blends are partially compatible. With the same content of PET and PEN in blends, two continuous phase of partly compatible and overlaping with each other were formed. DSC curves of the cooling process show the formation of separate crystals. But when the content of the second component is low, there might be some co-crystallites. The chain and segment of PET and PEN wrap and interact between each other, which interferes the crystallization process of molecules, leading to the crystallization imperfection and lower crystallinity during the cooling process. Like pure PET and pure PEN, PET/PEN blends also show the cold crystallization tendency.