UCST-type phase behaviour in poly(ethylene terephthalate-co-ethylene naphthalate)/poly(ether imide) blends
UCST-type phase behaviour in poly(ethylene terephthalate-co-ethylene naphthalate)/poly(ether imide) blends
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聚对苯二甲酸乙二醇酯-萘二甲酸乙二醇酯/聚醚酰亚胺共混物中的 UCST 型相行为
DOI：
10.1016/0032-3861(95)96852-y
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发表时间：
1995
期刊：
影响因子：
4.6
通讯作者：
Takashi Inoue
中科院分区：
文献类型：
--
作者：
N. Kinami;T. Okuyama;M. Okamoto;Takashi Inoue
采用浊点法、时间分辨光散射法研究了聚对苯二甲酸乙二醇酯-萘二甲酸乙二醇酯共聚物（PTN）与聚醚酰亚胺（PEI）的相容性。发现该系统具有上临界溶解温度（UCST）型相行为。PTN中萘二甲酸乙二醇酯（N）含量越高，UCST越低，相图中单相区越宽。从相图中估算了组成单体单元（i，j = N，T和EI，T和EI分别为对苯二甲酸乙二醇酯和醚酰亚胺）之间的二元相互作用参数χi/j与温度的关系。χT/N为正值，而χN/EI为负值，表明PTN与PEI的相容性主要是由N和EI单元之间的分子间相互作用引起的，而共聚物中T和N之间的分子内排斥作用起次要作用。基于χi/j的温度依赖性，建立了温度-共聚物组成相图。
Miscibility between poly(ethylene terephthalate-co-ethylene naphthalate) (PTN) and poly(ether imide) (PEI) was investigated by the cloud point method with the aid of time-resolved light scattering analysis on crystallization and liquid-liquid phase separation. The system was found to exhibit upper critical solution temperature (UCST) type phase behaviour. The higher the ethylene naphthalate (N) content in PTN, the lower the UCST and the wider the single-phase region in the phase diagram. From the phase diagrams, the temperature dependence of the binary interaction parameters χi/jbetween constituent monomeric units (i,j = N, T and EI; T and EI being ethylene terephthalate and ether imide, respectively was estimated. χT/Nwas a positive but small quantity while χN/EIwas negative, suggesting that the miscibility between PTN and PEI is mostly caused by an exothermic intermolecular interaction between N and EI units and that the repulsive intramolecular interaction between T and N in the copolymer plays a minor role. Based on the temperature dependence of χi/j, a miscibility map (temperature-copolymer composition phase diagram) was established.