Rapid repair and degradation: A study of high-performance recyclable vitrimer epoxy resin based on disulfide bonds

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Polymer Testing Pub Date : 2024-08-01 DOI:10.1016/j.polymertesting.2024.108528

Hechen Liu , Chang Liu , Yunpeng Liu , Yuzhe Jiang , Xinyang Li , Yining Bai

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Abstract

Petroleum-based epoxy resin is commonly used in electrical equipment due to its outstanding performance and affordability. However, its non-melting characteristics present challenges for recycling, leading to significant resource waste and environmental pollution. To address this issue, this study prepared and synthesized a kind of vitrimer epoxy resin polymer material based on disulfide bonds with 2,2′-Diaminodiphenyl disulphide as the curing agent. The research investigated the impact of the curing agent ratio on the resin's structure and properties. The resin was mechanically recovered through hot pressing at high temperature and pressure, and its chemical degradation and recovery were achieved via the reduction reaction of the thiol and disulfide bond. The findings revealed that a curing agent to epoxy group material ratio of 0.75 improved the resin system's electrothermal properties. The electrical insulation property retention rate after hot pressing recovery reached 95 %, with a mechanical property retention rate of 85 %. The disulfide bonds can be reoxidized and crosslinked to realize the recovery and reuse of vitrimer resin degradation solution. Vitrimer epoxy resin based on disulfide bonds is a significant way to realize the environmental protection of epoxy electrical equipment.

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快速修复和降解：基于二硫键的高性能可回收玻璃纤维环氧树脂研究

石油基环氧树脂因其出色的性能和经济实惠的价格而被广泛应用于电气设备中。然而，其不熔化的特性给回收利用带来了挑战，造成了严重的资源浪费和环境污染。针对这一问题，本研究以 2,2′-二氨基二苯基二硫醚为固化剂，制备并合成了一种基于二硫键的玻璃基环氧树脂聚合物材料。研究调查了固化剂配比对树脂结构和性能的影响。该树脂通过高温高压热压进行机械回收，并通过硫醇和二硫键的还原反应实现化学降解和回收。研究结果表明，固化剂与环氧基团材料的比率为 0.75，可改善树脂体系的电热性能。热压恢复后的电绝缘性能保持率达到 95%，机械性能保持率达到 85%。二硫键可进行再氧化和交联，实现了 Vitrimer 树脂降解液的回收和再利用。基于二硫键的 Vitrimer 环氧树脂是实现环氧电气设备环保的重要途径。

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来源期刊

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.