Department of Chemistry, Istanbul Technical University, Maslak, Istanbul, 34469, Turkey.
Macromol Rapid Commun. 2023 May;44(9):e2300066. doi: 10.1002/marc.202300066. Epub 2023 Apr 3.
Poly(methyl methacrylate) (PMMA) is a well-known and widely used commodity plastic. High production amount of PMMA causes excessive waste creation that highlights the necessity of recycling. Conventional recycling methods require elevated temperatures to induce degradation or depolymerization. In this work, visible light induced photodegradation system by using dimanganese decacarbonyl (Mn (CO) ) with high halogen affinity is reported. Halide functional photodegradable polymers are prepared by copolymerization of methyl methacrylate and methyl α-chloroacrylate by conventional reversible addition-fragmentation chain-transfer polymerization. Synthesized copolymers are efficiently degraded to low molecular weight oligomers under visible light irradiation in the presence of Mn (CO) . Characteristics of precursors, degraded polymers, and kinetics of depolymerization are investigated by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourrier transform infrared (FTIR), and proton nuclear magnetic resonance ( H-NMR) spectroscopies. The reported approach is expected to trigger further development of more environmentally friendly recycling techniques in the near future as we are moving toward a greener and more sustainable world.
聚甲基丙烯酸甲酯（PMMA）是一种众所周知且广泛使用的商品塑料。PMMA 的大量生产导致了过多的浪费，这凸显了回收的必要性。传统的回收方法需要高温来引发降解或解聚。在这项工作中，报告了使用具有高卤亲和力的二锰十羰基（Mn（CO））的可见光诱导光降解系统。通过常规可逆加成-断裂链转移聚合，将甲基丙烯酸甲酯和甲基α-氯代丙烯酸甲酯共聚制备卤代功能光降解聚合物。在 Mn（CO）存在下，合成的共聚物在可见光照射下有效地降解为低分子量低聚物。通过凝胶渗透色谱（GPC）、差示扫描量热法（DSC）、热重分析（TGA）、傅里叶变换红外（FTIR）和质子核磁共振（ H-NMR）光谱研究了前体、降解聚合物的特性和降解动力学。预计，随着我们迈向更绿色、更可持续的世界，这种方法将在不久的将来引发更环保的回收技术的进一步发展。
