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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. 棒状聚合物体系动态结构的细节已经从理论和实验两个方面进行了研究，并且很明显，在柔性相对较小的情况下，半柔性聚合物动态结构因子的定量估计是可能的。特别是，从具有单分散长度分布的胶原蛋白的实验结果来看，通过使用动态光散射技术可以对半柔性聚合物进行表征。 2. 考察了导电聚合物（聚亚芳基）的光学性能。这些聚合物具有较大的去偏度，可溶于合适的溶剂，从溶液性能与分子量之间的关系表明这些聚合物表现为半柔性聚合物。 3. 利用光研究了表现出独特热响应的聚（N异丙基丙烯酰胺）体系的溶液性能散射。在良好溶剂状态下，该聚合物表现出与通常的非极性聚合物体系类似的行为，但在不良溶剂状态下，显示出与浓度和分子量无关的相变。转变过程是线圈-球状转变，并且由于强疏水相互作用而发生相分离。并且，一些取代基的引入导致聚合物链的柔性发生变化，并伴随着显着的延迟。冷却时的热行为。 4.通过动态光散射研究了典型的磷脂膜双层DPPC囊泡的相变。该系统在光散射方面的相变行为存在许多相互矛盾的结果。从单分散囊泡样品的精确结果来看，很明显，相分离行为强烈依赖于囊泡的尺寸和尺寸分布，并且该结果一致地解释了到目前为止的结果。