Nonlinear Rheology of Random Sulfonated Polystyrene lononners: The Role of the Sol-Gel Transition

被引:36
|
作者
Huang, Chongwen [1 ]
Chen, Quan [2 ]
Weiss, R. A. [1 ]
机构
[1] Univ Akron, Dept Polymer Engn, Akron, OH 44325 USA
[2] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
基金
美国国家科学基金会;
关键词
METHACRYLIC ACID COPOLYMER; SHEAR-THICKENING BEHAVIOR; MELT RHEOLOGY; ASSOCIATIVE POLYMERS; THERMOREVERSIBLE GELATION; LINEAR VISCOELASTICITY; REVERSIBLE GELATION; FLOW GEOMETRY; IONOMERS; MODEL;
D O I
10.1021/acs.macromol.6b02057
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The linear and nonlinear rheological behaviors of non entangled sulfonated polystyrene (SPS) ionomers near the sol gel transition were studied. When the degree of sulfonation, p, was below the gel point, the ionomer exhibited sol-like linear viscoelastic (LVE) behavior, and shear thinning was observed for steady shear flow. For p dose to the gel point, the ionomer showed power-law-like LVE behavior over a wide frequency range. Strain hardening and shear thickening behavior were observed, and their magnitudes depended on the temperature, molecular weight of the PS precursor, and the Coulomb energy of the ion pair. Above the gel point, a distinct rubbery plateau was observed in the dynamic modulus. Melt fracture occurred upon start-up shear, which prevented quantitative examination of the nonlinear rheology. The possible mechanisms for strain hardening and shear thickening near the gel point are discussed with respect to formation of large dusters that nearly percolate in space.
引用
收藏
页码:9203 / 9214
页数:12
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