Accelerated photodegradation of PMMA films: Synergistic effect of mixed solvents

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-03-28 DOI:10.1016/j.jaap.2025.107106

Zhiping Xu , Xiangze Meng , Ying Liu, Rui Yang

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Abstract

As a widely used and versatile polymer, poly (methyl methacrylate) (PMMA) is difficult to degrade in the natural environment due to the inertness of the C-C bonds in the polymer chain. Pyrolysis with a high temperature of about 450 °C is a major but not eco-friendly method of waste PMMA degradation today. Herein, we report a photodegradation process of PMMA accelerated by small amounts of tetrahydrofuran (THF) and chloroform (TCM) at near room temperature. Compared with the blank samples, the mixed solvents accelerated the production of the methyl methacrylate (MMA) by about 130 times. A synergistic effect between the components of the mixed solvent was proved by experiments and density functional theory (DFT) calculations. The reaction of TCM with THF promotes the chlorination of the ester group of PMMA, and finally causes the accelerated photo-depolymerization of PMMA in a condition with relative mild temperature required. This new mechanism has the potential to become a new strategy for upcycling PMMA waste plastics.

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加速 PMMA 薄膜的光降解：混合溶剂的协同效应

聚甲基丙烯酸甲酯（PMMA）是一种用途广泛、用途广泛的聚合物，由于聚合物链中C-C键的惰性，使得其在自然环境中难以降解。目前，高温热解（450°C）是一种主要但不环保的降解PMMA废弃物的方法。本文报道了在接近室温的条件下，少量四氢呋喃（THF）和氯仿（TCM）加速了PMMA的光降解过程。与空白样品相比，混合溶剂可使甲基丙烯酸甲酯（MMA）的生成速度提高约130倍。通过实验和密度泛函理论（DFT）计算，证明了混合溶剂组分之间存在协同效应。中药与四氢呋喃的反应促进PMMA酯基的氯化反应，最终在相对温和的温度条件下加速PMMA的光解聚。这种新机制有可能成为PMMA废塑料升级利用的新策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Analytical and Applied Pyrolysis 化学-分析化学

CiteScore

9.10

自引率

11.70%

发文量

340

审稿时长

44 days

期刊介绍： The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.