Structure Formation and Relaxation Phenomena in Polymeric Systems

聚合物体系中的结构形成和松弛现象

• 批准号: 09450358
• 负责人: MIYAMOTO Yoshihisa
• 金额: $ 8.45万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450358/
• 关键词: POLYMER; CRYSTAL GROWTH; HIGHER ORDER STRUCTURES; SAXS; MORPHOLOGY; GLASS TRANSITION; 小開X線散乱; ガラス; X線小角散乱; 誘電緩和

Experiments and analysis were performed for the following three kinds of polymers.1. Polyethylene terephthalate : Simultaneous real-time measurements of dielectric relaxation and x-ray scattering were performed. Before crystallization is observed, the dielectric primary relaxation changes into another 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.2. Isotactic polystyrene : The dependence of growth rate and morphology on crystallization conditions was examined by x-ray scattering, atomic force and electron microscopies, . In the crystallization in thin film, it is shown that crystal morphology and the defects are affected by the substrates and that the morphology becomes diffusion-controlled with decreasing film thickness. Further, the growth rate is shown to be reciprocally proportional to the film thickness, and the results were interpreted in terms of the reptation model.3. Isotactic Polypropylene : The higher-order structure formation process is shown not to be spinodal-like but the nucleation process by the x-ray scattering. The glass transition temperature is found to decrease with the formation of smectic phase.

对以下三种聚合物进行了实验和分析。聚对苯二甲酸乙二酯：同时进行介电松弛和X射线散射的实时测量。在观察到晶化之前，介电一次弛豫转变为另一次弛豫，然后伴随着晶化发生介电弛豫的变化。对这一现象的解释是：晶化前非晶区分子运动模式发生变化，然后转变为晶片约束的模式。等规聚苯乙烯：用X射线散射法、原子力显微镜和电子显微镜研究了结晶条件对生长速度和形态的影响。在薄膜的晶化过程中，发现晶型和缺陷受衬底的影响，并且随着薄膜厚度的减小，晶型由扩散控制变为扩散控制。此外，生长速度与薄膜厚度成反比，并用旋转模型对结果进行了解释。等规聚丙烯：X射线散射显示高阶结构的形成过程不是旋节状的，而是成核过程。玻璃化转变温度随着近晶相的形成而降低。

项目成果

S.J.Sutton: "The morphology of isotactic polystyrene crystals grown in thin films; the effect of substrate material" J.Material Science. 32巻. 5621-5627 (1997)

S.J.Sutton：“薄膜中生长的等规聚苯乙烯晶体的形态；基材材料的影响”J.Material Science 32. 5621-5627 (1997)

Y.Miyamoto: "Crystal Growth of Polymers in Thin Films" Advances in Understanding of Crystal Growth Mechanisms (Elsevilv). 337-348 (1997)

Y.Miyamoto：“薄膜中聚合物的晶体生长”对晶体生长机制理解的进展 (Elsevilv)。

K.Fukao: "Dynamical Transition and Crystallization of Polymers" Phys.Rev.Lett.79. 4613-4616 (1997)

K.Fukao：“聚合物的动态转变和结晶”Phys.Rev.Lett.79。

Y.Miyamoto: "The morphology of isofuctic polystyrene crystals grown in thin films : the effect of substrate materials" J.Mater.Sci.32. 5621-5627 (1997)

Y.Miyamoto：“薄膜中生长的同沸聚苯乙烯晶体的形态：基材材料的影响”J.Mater.Sci.32。

K.Fukao: "Dynamical Transition and Crystallization of Polymers" Phys.Rev.Lett.79・23. 4613-4616 (1997)

K.Fukao：“聚合物的动态转变和结晶”Phys.Rev.Lett.79・23（1997）。