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Dynamic Viscoelasticity Behaviors of Magnesium Dimethacrylate/Natural Rubber Composites With Different Cure Extent

Chuanhui Xu,1 Yukun Chen,2,3 Liming Cao,2,3 Xingrong Zeng1 1 College of Material Science and Engineering, South China University of Technology, Guangzhou 510640, China 2

The Key Laboratory of Polymer Processing Engineering, Ministry of Education, China (South China University of Technology) Guangzhou, 510640, China

3

School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China

In this article, the dynamic viscoelasticity characteristics of the natural rubber (NR)/magnesium dimethacrylate (MDMA) composites with different cure extent are investigated using a Rubber Process Analyzer 2000 (RPA2000). A weak filler–filler network of MDMA is formed in the uncured compounds. MDMA polymerize during peroxide curing and change to the polymerized MDMA (PMDMA), which can aggregate to form strong filler network in the lightly cured composite. The ionic crosslinks and NR crosslinks influence the dynamic viscoelasticity characteristics of the MDMA/NR composites with different cure extent significantly. Although the PMDMA aggregates have strong attraction with each other to form filler network, the ionic crosslinks are not favorable to rebuild the PMDMA network when the NR crosslink network is mature. Finally, the torque verifies that the ionic crosslinks can be influenced by small strain magnitudes (

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