Dynamics of Semiflexible Polymers in Concentrated Solution : A Study by Optically-Labeled Dynamic Light Scattering

本课题主要研究半柔性高分子在浓溶液中的动力学行为。（1）在Doi等的基础上，利用模糊圆柱模型，推导了二元和三元半柔性聚合物溶液的动力学结构因子。的动力学平均场理论，这是最初适用于棒状聚合物的解决方案。公式化的结构因子用于分析下述动态光散射数据。(2)动态光散射测量的二氯甲烷（DCM）的半柔性聚合物，聚（正己基异氰酸酯）（PHIC）的解决方案，以获得作为聚合物浓度和分子量的函数的相互扩散系数。以前，相同的系统是通过粘度法研究的。(3)半柔性聚合物聚（3-苄氧基-羰基）-正丙基异氰酸酯）（PBPIC）用于上述光标记动态光散射实验 ...更多信息 下面，根据蠕虫状链模型进行分子表征。确定的蠕虫状链参数用于将光学标记的动态光散射数据与（6）中提到的模糊圆柱模型理论进行比较。(4)对PBPIC、PHIC和甲苯组成的三元溶液进行了动态光散射测量，其中甲苯是PHIC的等折射溶剂，光仅被PBPIC散射，这些光标记的动态光散射测量给出了PBPIC在PHIC溶液中的自扩散系数。(5)通过考虑有限浓度聚合物溶液中分子间流体动力学相互作用的影响，对模糊圆柱模型理论进行了修正。(6)修正的模糊圆柱模型理论与PHIC的DCM溶液的互扩散系数和PBPIC在PHIC溶液中的自扩散系数的实验结果进行了比较。该理论一致地解释了PHIC的DCM溶液的平移扩散和零剪切粘度行为。少

The present research project was concerned with the dynamics of semiflexible polymer in concentrated solution. The main results are summarized in the following :(1) Using the fuzzy cylinder model, the dynamical structure factors of binary and ternary semiflexible polymer solutions were formulated on the basis of Doi et al.'s dynamical mean-field theory, which was originally applied to rodlike polymer solutions. The formulated structure factors were used to analyze dynamic light scattering data mentioned below.(2) Dynamic light scattering measurements were made for dichloromethane (DCM) solutions of a semiflexible polymer, poly (n-hexyl isocyanate) (PHIC), to obtain the mutual diffusion coefficient as a function of the polymer concentration and molecular weight. Previously, the same system was studied by viscometry.(3) A semiflexible polymer, poly (3-benzyloxy-carbonyl) -n-propyl isocyanate) (PBPIC), which was used for the optically-labeled dynamic light scattering experiment mentioned … More below, was molecularly characterized in terms of the wormlike chain model. The wormlike chain parameters determined were used to compare optically-labeled dynamic light scattering data with the fuzzy cylinder model theory mentioned in (6).(4) Dynamic light scattering measurements were made for ternary solutions consisting of PBPIC,PHIC,and toluene, where toluene is an isorefractive solvent for PHIC so that light is scattered only by PBPIC.These optically-labeled dynamic light scattering measurements gave us the self-diffusion coefficient of PBPIC in PHIC solutions.(5) The fuzzy cylinder model theory was modified by including the effect of the intermolecular hydrodynamic interaction in polymer solutions with finite concentrations.(6) The modified fuzzy cylinder model theory was favorably compared with the experimental results of the mutual diffusion coefficient of DCM solutions of PHIC and of the self-diffusion coefficient of PBPIC in PHIC solutions. The theory consistently explained the translational diffusion and zero-shear viscosity behavior of DCM solutions of PHIC. Less