权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Viscoelastic Properties of Polyelectrolyte Solutions and Gels

聚电解质溶液和凝胶的粘弹性

基本信息

批准号：
63430019
负责人：
NODA Ichiro
金额：
$ 21.57万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

The main research results of this project are as follows :1) Preparation and Characterization of Polyelectrolyte with Narrow Molecular Weight Distributions : Anionically polymerized poly (2-vinylpyridine) was successfully quaternized with dimethyl sulfate in dimethyl formamide at room temperature without degradation and coloring to prepare poly (N-methy1-2vinylpyridinium chloride) (PMVP-C1) with narrow molecular weight distributions. The intrinsic viscosity-molecular weight (M) relationships of PMVP-C1 in the presence of added salt were determined.2) Viscoelastic Properties of Polyelectrolyte Solutions : Zeroーshear viscosity eta^0 and steadyーstate compliance J^e of PMVP-C1 with three different molecular weights were measured in the presence and absence of added salt with Mechanical and Fluid Spectrometers, a capillary viscometer and a flow birefringence apparatus. It was found that eta^0 is described by the scaling law at high added salt concentration (C_5), whereas it is not at low C_ … More 5. Moreover, It was found that J_0ocM^<-2>C^<-3>C_5 (C : polymer concentration) in dilute solutions ncontrast with nonーionic polymers, whereas J_6 depends on C only in entangled regions as for nonーionic poiymers but the C dependence is weaker than that of nonーionic polymers as J_8ocC^<-1.3>. These features of eta^0 and J_6 in entangled regions can be well explained by the tube model considering that the concentration of counterーion affects the formation of entanglements.3) Effects of From Birefringence on Flow Birefringence of Polymer Solutions in Semidilute Regions : It was found that the form birefringence disappears in semidilute solutions.4) ZeroーShear Viscosity of Block Copolymers in Semidilute Solutions : The eta^0 data can be described by the scaling law except for eta^0 in a selective solvent.5) Viscoelastic Properties of Polymer Solution at the Temperatures Lower Than the THETA-Point : The gel-like behavior of polymer solutions at the temperatures lower than the THETA-point is found to be ascribed to the long relaxation time due to high viscosity.6) Preparation and Characterization of Polymer Network : Polymer networks were prepared by reacting bifunctional polystyrene anion with crossーlinking agents and were characterized by swelling. Less

本课题主要研究成果如下：1)窄分子量分布聚电解质的制备与表征：在室温条件下，成功地将阴离子聚合聚（2-乙烯基吡啶）与硫酸二甲酯在二甲基甲酰胺中进行季铵化，未发生降解和着色，制备了窄分子量分布的聚（n -甲基-2 -乙烯基吡啶氯）（PMVP-C1）。测定了添加盐时PMVP-C1的特性粘度与分子量(M)的关系。2)聚电解质溶液的粘弹性特性：用力学和流体光谱仪、毛细管粘度计和流动双折射仪测量了三种不同分子量的PMVP-C1在添加盐和不添加盐的情况下的零剪切粘度eta^0和稳态粘度J^e。发现在高盐浓度（C_5）下，eta^0符合标度定律，而在低盐浓度（C_5）下则不符合标度定律。此外，发现J_0ocM^<-2>C^<-3>C_5 （C：聚合物浓度）在稀溶液中与非氧离子聚合物不同，而J_6仅依赖于非氧离子聚合物的纠缠区C，但对C的依赖弱于非氧离子聚合物，因为J_8ocC^<-1.3>。考虑到反离子的浓度会影响缠结的形成，管模型可以很好地解释纠缠区的eta^0和J_6的这些特征。3)从双折射对半稀区聚合物溶液流动双折射的影响：发现在半稀区聚合物溶液中双折射形式消失。4)半稀溶液中嵌段共聚物的零剪切粘度：除选择性溶剂中的eta^0外，eta^0数据可用标度定律描述。5)低于theta点温度下聚合物溶液的粘弹性特性：发现聚合物溶液在低于theta点温度下的凝胶状行为归因于高粘度引起的长松弛时间。6)聚合物网络的制备与表征：采用双官能团聚苯乙烯阴离子与交联剂反应制备聚合物网络，并以膨胀为表征。少