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<p>Methyl vinyl silicone rubber (MVQ) suffers from intrinsic mechanical weakness and environmental aging. To address these issues, we developed grafted-opal@CeOx (g-opal@CeOx) via thiol-ene click chemistry, integrating interfacial compatibility enhancement with CeOx-based anti-aging functionality. The Kissinger method was used to calculate the average apparent activation energy of crosslinking reactions. The Mooney viscosity values, viscoelasticity analysis and molecular dynamics simulation results demonstrated that g-opal@CeOx enhanced the interfacial compatibility between MVQ and opal. After adding 12&#xa0;g of g-opal@CeOx, the tear strength increased by 3.1 times compared to MVQ and the tensile strength was 2.16 times that of MVQ. Molecular dynamics simulations quantitatively confirmed strengthened interfacial interactions between MVQ and g-opal@CeOx. The UV aging test showed that MVQ was mainly crosslinked in the early stage of aging, and mainly hydrolyzed and broken in the later stage. Adding g-opal@CeOx to MVQ reduced the percentage of tensile strength loss from 23.5% to 10.4% and only reduced the contact angle by 7°. The thermal-oxidative aging kinetic analysis showed that g-opal@CeOx extended the lifespan of MVQ in thermal oxidation environments.</p>

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Preparation and enhanced aging resistance of methyl vinyl silicone rubber/g-opal@CeOx modified by thiol-ene click chemistry

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Yuhang Ma,
  • Tengfei Shao,
  • Zhiqing Liu,
  • Weijun Zhen

摘要

Methyl vinyl silicone rubber (MVQ) suffers from intrinsic mechanical weakness and environmental aging. To address these issues, we developed grafted-opal@CeOx (g-opal@CeOx) via thiol-ene click chemistry, integrating interfacial compatibility enhancement with CeOx-based anti-aging functionality. The Kissinger method was used to calculate the average apparent activation energy of crosslinking reactions. The Mooney viscosity values, viscoelasticity analysis and molecular dynamics simulation results demonstrated that g-opal@CeOx enhanced the interfacial compatibility between MVQ and opal. After adding 12 g of g-opal@CeOx, the tear strength increased by 3.1 times compared to MVQ and the tensile strength was 2.16 times that of MVQ. Molecular dynamics simulations quantitatively confirmed strengthened interfacial interactions between MVQ and g-opal@CeOx. The UV aging test showed that MVQ was mainly crosslinked in the early stage of aging, and mainly hydrolyzed and broken in the later stage. Adding g-opal@CeOx to MVQ reduced the percentage of tensile strength loss from 23.5% to 10.4% and only reduced the contact angle by 7°. The thermal-oxidative aging kinetic analysis showed that g-opal@CeOx extended the lifespan of MVQ in thermal oxidation environments.