Chemical crosslinking, physical associating, and filler filling play vital roles in nonlinear responses of rubbers under large amplitude oscillatory shear (LAOS). Herein, a systematical investigation was performed for polyisoprene rubber vulcanizates and compounds on the framework of LAOS analytical methods to quantify intra- and intercycle nonlinearities. It is shown that the Payne effect is featured by intercycle strain softening and intracycle hardening. Furthermore, chemical crosslinking and intermolecular association cause marked shear thickening at the medium range of rate amplitude, which is related to the nonideally crosslinked structures from numerical studies. Fillers can promote nonlinear viscoelastic behaviors. In compounds, modulus recovery during cyclic oscillatory shear deformation is not directly related to the reorganization of the filler phase, which is testified by simultaneous measurements of rheological responses and electrical resistivity during increasing-decreasing amplitude sweep cycles.
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July 2020
Research Article|
July 01 2020
Influences of chemical crosslinking, physical associating, and filler filling on nonlinear rheological responses of polyisoprene
Xinpeng Fan
;
Xinpeng Fan
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University
, Hangzhou 310027, China
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Huilong Xu;
Huilong Xu
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University
, Hangzhou 310027, China
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Chenjun Wu;
Chenjun Wu
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University
, Hangzhou 310027, China
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Yihu Song
;
Yihu Song
a)
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University
, Hangzhou 310027, China
a)Author to whom correspondence should be addressed; electronic mail: [email protected].
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Qiang Zheng
Qiang Zheng
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University
, Hangzhou 310027, China
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a)Author to whom correspondence should be addressed; electronic mail: [email protected].
J. Rheol. 64, 775–784 (2020)
Article history
Received:
August 10 2019
Accepted:
April 03 2020
Citation
Xinpeng Fan, Huilong Xu, Chenjun Wu, Yihu Song, Qiang Zheng; Influences of chemical crosslinking, physical associating, and filler filling on nonlinear rheological responses of polyisoprene. J. Rheol. 1 July 2020; 64 (4): 775–784. https://doi.org/10.1122/1.5124034
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