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Studies of self-assenbled structures in polymer alloy under external field

外场作用下聚合物合金自组装结构的研究

基本信息

批准号：
05453149
负责人：
HASHIMOTO Takeji
金额：
$ 5.5万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05453149/
关键词：
Polymer Alloy Block copolymer Flow-SALS Shear-induced phase separation Optical microscope Small-angle X-ray scattering Image processing Butterfly pattern 高分子ブレンドズリ流動光散乱

项目摘要

Using light scattering measurements of polystirene/polybutadiene/DOP semidilute solutions under shear flow, we observed shear-induced homogenization and obtained the composition dependence of the critical shear rate. In the string phases, which are observed in the steady state of two-phase region under shear flow, we confirmed that shear flow strongly suppressed undulation of the interface. We observed the effect of oscillatory shear flow on the spinodal decomposition of polybutadiene/polyisoprene mixtures and stirene-butadiene rubber/butadiene mixtures.To obtain fundamental knoeledge on the polymers under shear flow, we observed light scatterng and microscopic images of high molecular weight polystirene/DOP and high molecular weight polyethylene/paraffin semidilute solutions. We obtained the typical butterfly type scattering patterns by SALS and the concentration fluctuations by microscopy which caused such scattering patterns. In the high shear rate regime where we observed rheological and scattering anomalies we confirmed that the string phase like the above-mentioned occurred.To observe orientation and deformation of microdomain structures of block copolymers under shear flow, we constructed the control system of shear deformation apparatus and two-dimensional X-ray scattering detector (imaging plate). Using this system, deformation and relaxation of orientation in spherical and lamellae microdomains under oscillatory shear flow have been clarified.

利用光散射测量剪切流下的聚苯乙烯/聚丁二烯/DOP半稀溶液，我们观察到剪切诱导的均匀化，并获得了临界剪切速率的组成依赖性。在剪切流作用下两相区稳定状态下观察到的弦状相中，我们证实了剪切流强烈地抑制了界面的起伏。本文观察了振荡剪切流对聚丁二烯/聚异戊二烯和丁苯橡胶/丁二烯混合物旋节线分解的影响，并对高分子量聚苯乙烯/DOP和高分子量聚乙烯/石蜡半稀溶液进行了光散射和显微图像观察。我们得到了典型的蝴蝶型散射图案的SALS和浓度波动，由显微镜引起的这种散射图案。在高剪切速率区，我们观察到流变和散射异常，证实了上述的弦相的出现。为了观察剪切流动下嵌段共聚物微区结构的取向和变形，我们构建了剪切变形装置和二维X射线散射检测器（成像板）的控制系统。利用该系统，阐明了在振荡剪切流作用下球形和层状微畴的形变和取向弛豫。