Rapid degradation of thermosetting ester epoxies and monomer recovery methods

IF 2.2 4区化学 Q3 CHEMISTRY, PHYSICAL

Colloid and Polymer Science Pub Date : 2024-07-03 DOI:10.1007/s00396-024-05287-2

Xinyue Hu, Hanbing Ma, Baineng Zhou, Yinjie Deng, Wen Li

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Abstract

The degradation and recycling of waste epoxy resins is an urgent environmental problem, encouraging the use of degradable thermosetting epoxies. In this study, a high-performance thermosetting epoxy resin material that can be easily degraded and recycled was prepared using a low-viscosity and high-activity epoxy monomer, tetrahydrophthalic acid diglycidyl ester. Owing to the breakable ester bond in this epoxy monomer, the thermosetting three-dimensional epoxy cross-linked structure can be rapidly degraded using ethylene glycol at atmospheric pressure. After further depolymerization of the epoxy resin/glycol solution with NaOH, sodium cyclohexene-2-carboxylate was obtained. The sodium salt was acidified, epoxidized, and then re-prepared to obtain the epoxy monomer diglycidyl tetrahydrophthalate. The recycled epoxy monomer possesses the same thermal and mechanical properties as the original epoxy monomer, thus realizing the economic and environmentally friendly degradation and recycling of the thermosetting epoxy resin under mild conditions, and this recycling method is applicable to epoxy systems with ester bonding in the cured material.

Graphical Abstract

Abstract Image

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热固性酯类环氧树脂的快速降解和单体回收方法

废弃环氧树脂的降解和回收利用是一个亟待解决的环境问题，因此鼓励使用可降解的热固性环氧树脂。本研究利用低粘度、高活性环氧单体--四氢邻苯二甲酸二缩水甘油酯，制备了一种易于降解和回收的高性能热固性环氧树脂材料。由于这种环氧单体中存在可断裂的酯键，因此可在常压下使用乙二醇快速降解热固性三维环氧交联结构。环氧树脂/乙二醇溶液用 NaOH 进一步解聚后，得到环己烯-2-羧酸钠。将钠盐酸化、环氧化，然后重新制备得到环氧单体二缩水甘油四氢邻苯二甲酸酯。回收的环氧单体具有与原始环氧单体相同的热性能和机械性能，从而实现了热固性环氧树脂在温和条件下经济、环保的降解和回收，这种回收方法适用于固化物中具有酯键的环氧体系。

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来源期刊

Colloid and Polymer Science 化学-高分子科学

CiteScore

4.60

自引率

4.20%

发文量

111

审稿时长

2.2 months

期刊介绍： Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.