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Study of Flexibility of Polymer Chain and intramolecular motion.

聚合物链的柔韧性和分子内运动的研究。

基本信息

批准号：
62550647
负责人：
KUBOTA Kenji
金额：
$ 1.15万
依托单位：
Gunma University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

1. The details of dynamic structure of rod-polymer systems have already been studied from both theoretical and experimental points, and it becomes clear that in case of relatively small flexibility the quantitative estimation of dynamic structure factor of semiflexible polymers is possible. Especially, from the experimental results for Collagen with monodisperse length distribution the characterization of semiflexible polymer becomes to be available by use of dynamic light scatttering technique. 2. The optical properties of electrically conducting polymers (poly(arylenes) were examined. These polymers have large degree of depolarization and are soluble in suitable solvents, and it is clarified that these polymers behave as semiflexible polymers from the relation between the solution properties and molecular weight. 3. The solution properties of Poly(Nisopropylacrylamide) systems which show unique thermal response were studied by use of light scattering. In the good solvent state, this polymer shows the similar behavior to usual nonpolar polymer systems, but in the poor solvent state, shows phase transiton independent of the concentration and molecular weight. The process of transition is the coil-globule transition, and due to strong hydrophobic interaction the phase separation occurs. And, introduction of some substitution group causes the change of flexibility of polymer chain and a significant retardation accompanies in the thermal behavior when cooling. 4. The phase transition of DPPC vesicles which is the typical phospholipid membrane bilayer was studied by dynamic light scattering. There were many conflicting results for the phase transition behavior of this systems in terms of light scattering. From the precise results for the monodisperse vesicle samples, it becomes clear that the phase separation behavior strongly depends on the size and size distribution of vesicles and this result explains consistently the results so far.

1. 从理论和实验两方面对棒-聚合物体系的动态结构进行了详细的研究，在柔性较小的情况下，对半柔性聚合物的动态结构因子进行定量估计是可能的。特别是从单分散长度分布的胶原蛋白的实验结果来看，动态光散射技术可以用于半柔性聚合物的表征。2. 研究了导电聚合物（聚芳烯）的光学性质。这些聚合物具有大的去极化度，可溶于合适的溶剂，从溶液性质与分子量的关系中阐明了这些聚合物具有半柔性聚合物的性质。3. 利用光散射技术研究了具有独特热响应特性的聚异丙基丙烯酰胺体系的溶液性质。在良好的溶剂状态下，该聚合物表现出与通常的非极性聚合物体系相似的行为，但在不良的溶剂状态下，该聚合物表现出与浓度和分子量无关的相变。转变过程为卷-球转变，由于强疏水相互作用而发生相分离。某些取代基的引入使聚合物链的柔韧性发生了变化，冷却时的热行为发生了明显的阻滞。4. 采用动态光散射法研究了典型磷脂膜双分子层DPPC囊泡的相变。在光散射方面，该体系的相变行为有许多相互矛盾的结果。从单分散囊泡样品的精确结果可以清楚地看出，相分离行为强烈依赖于囊泡的大小和大小分布，这一结果与迄今为止的结果一致。