Dynamic Viscoelasticity of Polymer Solutions

聚合物溶液的动态粘弹性

• 批准号: 8715567
• 负责人: Eric Amis
• 金额: $ 16.98万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-05-01 至 1991-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8715567&HistoricalAwards=false
• 关键词: Dynamic; Viscoelasticity; Polymer; Solutions

The dynamic storage and loss moduli of polymer solutions will be measured using an extremely sensitive resonator instrument which has been constructed in the principal investigator's laboratory. For dilute polymer solutions, the intrinsic moduli will be obtained by concentration extrapolation of measured moduli; these moduli reflect the molecular relaxation processes of the polymer chain. Linear, star, and cyclic random- coil polymers of matched molecular weights will be studied in dilute solutions; polymers in solvents with varying thermodynamic quality or specific solvent-polymer interactions; polymer with side chains which modify their molecular flexibility; block copolymers where the blocks can be preferentially solvated; polyelectrolytes; and polymers which undergo reversible transformations of structural conformation. In addition, a systematic study will be undertaken with respect to modification of chain relaxations caused by initial chain interactions at low concentrations where chains just begin to overlap. For all well- characterized polymers will be used so that the results will be suitable for testing theoretical predications and for comparisons to complementary experiments.

聚合物溶液的动态储能模量和损耗模量将使用首席研究员实验室建造的极其灵敏的谐振器仪器进行测量。 对于稀聚合物溶液，通过测量模量的浓度外推得到固有模量；这些模量反映了聚合物链的分子弛豫过程。 将在稀溶液中研究匹配分子量的线性、星形和环状无规卷曲聚合物；溶剂中的聚合物具有不同的热力学性质或特定的溶剂-聚合物相互作用；具有侧链的聚合物可改变其分子灵活性；嵌段共聚物，其中嵌段可以优先被溶剂化； 聚电解质；以及经历结构构象可逆转变的聚合物。 此外，还将针对低浓度下链刚刚开始重叠的初始链相互作用引起的链松弛的修改进行系统研究。 对于所有特征良好的聚合物，将使用这样的结果将适合于测试理论预测并与补充实验进行比较。