聚合
聚合物
戒指(化学)
材料科学
高分子科学
开环聚合
有机化学
高分子化学
化学
化学工程
复合材料
工程类
作者
Ting Shen,Kaihao Chen,Yougen Chen,Jun Ling
标识
DOI:10.1002/marc.202300099
摘要
Abstract To cope with the severe plastic waste crisis, massive efforts are made to develop sustainable polymer materials whose degradation involves a disposing and decomposing to small molecule (DDM) and/or a chemical recycling to monomer (CRM) process. Polyacetals, a type of pH‐responsive polymers, are degradable under acidic conditions, while highly stable under neutral and basic circumstances. As for their synthesis, the cationic ring‐opening polymerization (CROP) of cyclic acetals is an elegant and promising approach, though suffering from fatal side reactions and polymerization‐depolymerization equilibrium. Recent development in CRM restimulates the interest in the long‐forgotten CROP method due to its inherent depolymerization characteristics. In terms of the end‐of‐life options, polyacetals are recyclable materials with both DDM and CRM potentials. They not only expand the scope of materials for closed‐loop recycling but also help to tune the degradation properties of traditional polyesters and polyolefins. This review aims to discuss the synthesis of various polyacetals by CROP and their degradation properties from the perspectives of 1) polymerization of cyclic acetals, dioxepins, and hemiacetal esters, 2) copolymerization of cyclic acetals with heterocyclic or vinyl monomers, and 3) degradation and recycling properties of the related polymers.
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