聚烯烃
酮
材料科学
混溶性
聚合物
催化作用
高分子化学
有机化学
链条(单位)
化学工程
高分子科学
化学
物理
天文
工程类
图层(电子)
作者
Xin Liu,Zhitao Hu,Brandon S. Portela,Emma M. Rettner,Antonio Pineda,Joel Miscall,Nicholas A. Rorrer,Amber T. Krummel,Robert S. Paton,Garret M. Miyake
标识
DOI:10.1002/anie.202418411
摘要
Herein, we report a selective photooxidation of commodity postconsumer polyolefins to produce polymers with in-chain ketones. The reaction does not involve the use of catalyst, metals, or expensive oxidants, and selectively introduces ketone functional groups. Under mild and operationally simple conditions, yields up to 1.23 mol % of in-chain ketones were achieved. Installation of in-chain ketones resulted in materials with improved adhesion of the materials and miscibility of mixed plastics relative to the unfunctionalized plastics. The introduction of ketone groups into the polymer backbone allows these materials to react with diamines, forming dynamic covalent polyolefin networks. This strategy allows for the upcycling of mixed plastic waste into reprocessable materials with enhanced performance properties compared to polyolefin blends. Mechanistic studies support the involvement of photoexcited nitroaromatics in consecutive hydrogen and oxygen atom transfer reactions.
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