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Structure Formation and Relaxation Phenomena in Polymeric Systems

聚合物体系中的结构形成和松弛现象

基本信息

批准号：
07651104
负责人：
MIYAMOTO Yoshihisa
金额：
$ 1.41万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07651104/
关键词：
POLYMER CRYSTAL GROWTH HIGHER ORDER STRUCTURES SAXS DIELECTRIC RELAXATION

项目摘要

Experiments and analysis were performed for the following three kinds of polymers.1.Isotactic polystirene : From small-angle x-ray scattering and electron microscopy, it is clarified that the crystal thickness is larger than the amorphous one, although the degree of crystallinity of specimen is about 30%. The long spacing is quantitatively obtained by the atomic force microscopy on the surface of crystallized thin film. In the crystallization in thin film, it is shown that crystal morphology and the dislocations are affected by the substrates and that the growth rate is reciprocally proportional to the film thickness, and the results were interpreted in terms of the reptation model.2.Polyethylene terephthalate : Simultaneous real-time measurements of dielectric relaxation and x-ray scattering was performed. Before crystallization is observed, the dielectric alpha relaxation changes into another alpha'relaxation, then the change in dielectric relaxation occurs accompanying the crystallization. This phenomena are interpreted as follows : the mode of molecular motion in amorphous region changes prior to crystallization and then the mode changes into the one constrained by the crystalline lamellae.3.Polyvinylidene fluoride : From the simultaneous real-time measurements of dielectric relaxation and x-ray scattering during the crystallization process from the melt, it is shown that the growth of lamellar structure and the relaxation the crystalline region are simultaneously developed.

对以下三种聚合物进行了实验和分析：1.等规聚苯乙烯：从小角X射线散射和电子显微镜可以清楚地看出，虽然样品的结晶度约为30%，但晶体厚度大于非晶厚度。用原子力显微镜定量测量了晶化薄膜表面的长间距。在薄膜中的结晶，它示出的晶体形态和位错的基板的影响和生长速率是成正比的膜厚度，并解释的爬行模型的条款的结果。2.聚对苯二甲酸乙二醇酯：同时进行实时测量的介电弛豫和X射线散射。在观察到晶化之前，介电α弛豫转变为另一个α弛豫，然后介电弛豫的变化伴随着晶化发生。这一现象的解释是：在结晶之前，非晶区分子的运动模式发生了变化，然后转变为受结晶片层约束的运动模式。从熔体结晶过程中的介电弛豫和X射线散射的同时实时测量，结果表明，层状结构的生长和晶区的弛豫是同时发生的。