Conformation and Dynamics of Polyelectrolytes in Non-Aqueous Solutions

非水溶液中聚电解质的构象和动力学

基本信息

批准号：
08455451
负责人：
NODA Ichiro
金额：
$ 4.99万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

In this research project the effects of dielectric constant on expansion, intermolecular interactions and viscoelastic properties of polyelectrolytes were studied. The main conclusions obtained here are the followings.1.Expansion and Interactions of Polyelectrolytes in Non-Aqueous Dilute SolutionsPolyelectrolytes used here were sodium poly (stirene sulfonate) s (NaPSS) with different molecular weights, prepared by sulfonation of polystirenes with narrow molecular weight distributions according to Vink's method. The degrees of sulfonation of the samples are nearly 100%.Measurments of light scattering and viscosity were carried out for the NaPSS samples in dilute solutions of formamide, of which the dielectric constant (epsilon=111) is higher than water (epsilon=80.1), in the presence of added salt (NaCl). It was found that the radius of gyration and intrinsic viscosity in formamide solutions are larger than in aqueous solutions, though their molecular weight dependencies in the former a … More re similar to those in the latter, and the second virial coefficients in the former are also larger than in the latter. This means that the magnitude of excluded volume effects in formamide solutions is larger than in aqueous solutions.2.Viscoelastic Properties of Polyelectrolytes in Non-Aqueous SolutionsZero-shear viscosity eta^0 and steady state compliance J_e of the NaPSS samples were measuerd in aqueous and non-aqueous solutions in the absence and presence of added salts (NaCl) by oscillatory, creep and creep recovery experiments. Non-aqueous solvents used here were formamide and ethylene glycohol (epsilon=38), of which the dielectric constants are higher and lower than that of water, respectively. It was found that eta^0 and J_e in formamide solutions have almost the same molecular weight and polymer concentration dependencies as in aqueous solutions in dilute, semidilute and concentrated regions, while in ethylene glycohol solutions they have almost the same dependencies as for neutral polymers in good solvents in the three concentration regions. Less

在该研究项目中，饮食常数对聚电解质的分子间相互作用和粘弹性的影响进行了研究。这里获得的主要结论是以下。1。在此使用的非水稀释溶液中聚电解质的膨胀和相互作用是使用不同分子量的硫酸钠（搅拌硫酸盐）S（搅拌硫酸盐）S（NAPS）S（NAPS）S（NAPS）与不同的分子量，由较窄的分布分布的硫酸盐来制备。样品的磺化程度几乎为100％。在稀释剂溶液中，在二层常数（Epsilon = 111）的稀释溶液中对小睡样品进行了光散射和粘度，在存在的情况下（Epsilon = 111）（Epsilon = 80.1），在添加盐的情况下（Nacl）。已经发现，尽管它们的分子量依赖性在前者A中的分子量依赖性，但在形式溶液中的回旋和固有粘度的半径比水溶液中的半径更大……与后者中的分子量依赖性更相似，而前者中的第二个虚拟系数也比后者更大。 This means that the magnitude of excluded volume effects in formide solutions is larger than in aqueous solutions.2.Viscoelastic Properties of Polyelectrolytes in Non-Aqueous SolutionsZero-shear viscosity eta^0 and steady state compliance J_e of the NaPSS samples were measured in Aqueous and non-aqueous solutions in the absence and presence of added salts (NaCl) by oscillatory, creep and creep恢复实验。此处使用的非水溶液是格形溶液和乙二醇（Epsilon = 38），其中饮食常数分别高和低于水。发现形式溶液中的ETA^0和J_E的分子量和聚合物浓度依赖性几乎与稀溶液中的水溶液中的分子量和聚合物浓度依赖性相同，而在乙烯甘油糖溶液中，它们在三个浓度区域中具有良好溶液中的中性聚合物几乎具有相同的依赖性。较少的