Characterization and analyses on complex melting, polymorphism, and crystal phases in melt-crystallized poly(hexamethylene terephthalate)
Characterization and analyses on complex melting, polymorphism, and crystal phases in melt-crystallized poly(hexamethylene terephthalate)
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DOI：
10.1021/ma0473667
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发表时间：
2005-05
期刊：
影响因子：
5.5
通讯作者：
A. Ghosh;E. Woo;Ya-Sen Sun;Li-Ting Lee;Ming-Chien Wu
中科院分区：
文献类型：
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作者：
A. Ghosh;E. Woo;Ya-Sen Sun;Li-Ting Lee;Ming-Chien Wu
利用热分析、广角x射线衍射和小角x射线散射技术揭示了多晶聚合物中复杂熔融行为与各种晶体形式之间的关系。聚对苯二甲酸己二酯（PHT）中多个熔融恒温体与多晶型之间的关系是一个非常有趣的问题，在大多数温度下，PHT中最多有6个多晶熔融恒温体（P1−P6）和最多2个由α-和β-晶体细胞填充的球晶型。虽然P1和P3峰较早被认为是α-型的熔融，P2和P5峰被认为是β-型的熔融，但P4峰尚未被解析，这在PHT低温熔融结晶中是不存在的。在本研究中，对预结晶PHT的高温退火进一步解析了第4个峰P4，发现它与α-型最完美、最厚的晶片相关联。Correlat……
Techniques of thermal analysis, wide-angle X-ray diffraction, and small-angle X-ray scattering were used to reveal relationships between complex melting behavior and various crystal forms in a polymorphic polymer. Correlation between the multiple melting endotherms and polymorphic crystalline forms in poly(hexamethylene terephthalate) (PHT) is a very intriguing one, which shows a maximum of six polymorphic melting endotherms (P1−P6) and up to two spherulitic forms packed with α- and β-crystal cells upon melt-crystallization at most temperatures. While the peaks P1 and P3 have been earlier assigned to the melting of the α-form and the peaks P2 and P5 are attributed to the β-forms, however, P4 was yet to be resolved, which was absent in PHT melt-crystallized at lower temperatures. In this study, the fourth peak, P4, was further resolved by high-temperature annealing of precrystallized PHT, and it was found to be associated with the most perfect and thus the thickest crystalline lamellae of α-forms. Correlat...