Construction of topological entanglement at the interface between silicone rubber and nano-silica to achieve excellent crack extension resistance

Jiang, Linru and Li, Jingchao and Zhang, Weizhen and Lu, Yonglai and Zhang, Liqun (2023) Construction of topological entanglement at the interface between silicone rubber and nano-silica to achieve excellent crack extension resistance. EXPRESS POLYMER LETTERS, 17 (5). pp. 512-526. ISSN 1788-618X

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Abstract

The poor tear resistance of silicone rubber dramatically limits its application range. In this study, a topological entanglement structure of molecular chains was constructed at the interface between the matrix and silica by introducing epoxidized silicone rubber into silicone rubber/silica composites. We found that this topologically entangled structure could improve the crack propagation resistance of the composites by inducing the orientation of molecular chains. The results showed that adding 5 phr of 15% epoxy silicone rubber raised the silicone rubber composite’s tear strength and elongation at break, they increased by 330% and 140%, respectively. This work provides a new idea for preparing silicone rubber composites with high tear resistance to better expand the application field of silicone rubber.

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