Depolymerization of Polymethacrylates by Iron ATRP
Depolymerization of Polymethacrylates by Iron ATRP
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DOI：
10.1021/acs.macromol.2c01712
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发表时间：
2022-11-28
期刊：
影响因子：
5.5
通讯作者：
Matyjaszewski, Krzysztof
中科院分区：
文献类型：
--
作者：
Martinez, Michael R.;Schild, Dirk;Matyjaszewski, Krzysztof
随着对循环经济的关注，聚合物的回收利用变得越来越重要。受控的自由基聚合通过活化休眠的聚合物链端官能度来产生聚合和解聚的途径。在这里，解聚聚（甲基丙烯酸甲酯）（PMMA）和聚（甲基丙烯酸正丁酯）（PBMA）的大分子引发剂与末端氯链端功能介导的氯化铁盐和铁粉在170 ° C的报告。以聚苯乙烯为内标，通过GPC进行动力学测量。四（乙二醇）二甲醚比1，2，4-三氯苯实现更高的转化率和解聚率。使用零价Fe 0作为补充活化剂和还原剂进行解聚是最有效的，在10wt%固体聚甲基丙烯酸酯负载量下可达到>70%的转化率，且反应速率快。通过蒸馏回收解聚过程中分离的单体。
Recycling of polymers has become increasingly relevant with the focus on a circular economy. Controlled radical polymerizations create an avenue for polymerization and depolymerization through activation of the dormant polymer chain-end functionality. Here, the depolymerizations of poly(methyl methacrylate) (PMMA) and poly(n-butyl methacrylate) (PBMA) macroinitiators with terminal chlorine chain-end functionality mediated by iron chloride salts and iron powder at 170 degrees C are reported. The depolymerizations were conducted with polystyrene as internal standard for kinetics measurements by GPC. Higher conversion and depolymerization rates were achieved in tetra(ethylene glycol) dimethyl ether than in 1,2,4-trichlorobenzene. Depolymerization with zerovalent Fe0 as a supplemental activator and reducing agent was the most effective, reaching >70% conversion at 10 wt % solid polymethacrylate loadings with fast reaction rates. The monomer isolated during the depolymerization was recovered through distillation.