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.

聚合物溶液的动态存储和损耗模量将使用非常敏感的谐振仪器进行测量，该谐解仪器已在主要研究者的实验室中构建。 对于稀聚合物溶液，将通过浓度推断测得的模量来获得内在的模量。这些模量反映了聚合物链的分子松弛过程。 将在稀溶液中研究匹配的分子量的线性，星和循环随机聚合物。具有不同热力学质量或特定溶剂聚合物相互作用的溶剂中的聚合物；聚合物带有侧链，可改变其分子柔韧性；块共聚物，可以优先溶剂化块； 聚电解质；以及结构构象的可逆转换的聚合物。 此外，将对由链条开始重叠的低浓度的初始链相互作用引起的链条弛豫的修改进行系统研究。 对于所有特征良好的聚合物，将使用结果，适合于测试理论谓词和与互补实验的比较。