热固性聚合物
化学
单体
亲核细胞
聚合物
共价键
三嗪
有机化学
组合化学
烷氧基
烷基
高分子化学
催化作用
作者
Zepeng Lei,Hongxuan Chen,Chaoqian Luo,Yicheng Rong,Yueyun Hu,Yinghua Jin,Rong Long,Kai Yu,Wei Zhang
出处
期刊:Nature Chemistry
[Springer Nature]
日期:2022-09-26
卷期号:14 (12): 1399-1404
被引量:60
标识
DOI:10.1038/s41557-022-01046-4
摘要
Chemical recycling of polymers is critical for improving the circular economy of plastics and environmental sustainability. Traditional thermoset polymers have generally been considered permanently crosslinked materials that are difficult or impossible to recycle. Herein, we demonstrate that by activating ‘dormant’ covalent bonds, traditional polycyanurate thermosets can be recycled into the original monomers, which can be circularly reused for their original purpose. Through retrosynthetic analysis, we redirected the synthetic route from forming conventional C–N bonds via irreversible cyanate trimerization to forming the C–O bonds through reversible nucleophilic aromatic substitution of alkoxy-substituted triazine derivatives by alcohol nucleophiles. The new reversible synthetic route enabled the synthesis of previously inaccessible alkyl-polycyanurate thermosets, which exhibit excellent film properties with high chemical resistance, closed-loop recyclability and reprocessing capability. These results show that ‘apparently dormant’ dynamic linkages can be activated and utilized to construct fully recyclable thermoset polymers with a broader monomer scope and increased sustainability.
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