Polyolefin vitrimers bearing acetoacetate functionality  

作　　者：Zihao Wang Yue Liu Wenmin Pang Ao Chen Min Chen 

机构地区：[1]Chinese Academy of Sciences(CAS)Key Laboratory of Soft Matter Chemistry,Department of Polymer Science and Engineering,University of Science and Technology of China,Hefei 230026,China [2]Institutes of Physical Science and Information Technology,Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education,Anhui University,Hefei 230601,China

出　　处：《Science China Chemistry》2024年第11期3861-3867,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (21971230, U19B6001);the Natural Science Foundation of Anhui Province (2308085Y35, 2023AH030002);the Hefei Natural Science Foundation (202304);the strong support from Professor Changle Chen (University of Science and Technology of China)。

摘　　要：Polyolefin vitrimers are polymer networks bearing reversible covalent crosslinking points, enabling them to be reprocessed and recycled. In this contribution, a series of polyolefin vitrimers were designed based on the acetoacetate-functionalized polyolefin copolymers, which were produced through the direct copolymerization of ethylene with polar comonomers using a phosphinesulfonate palladium catalyst. The pendant acetoacetate group could mediate several characteristic reactions, such as the Michael addition reaction, ketone-amine condensation and metal coordination reaction. As such, structurally adjustable polyolefin vitrimers can be accessed by introducing various dynamic crosslinking bonds, including disulfide exchange, transamination of vinylogous urethane and labile metal coordination bond. The utilization of different crosslinking reactions and the mole ratio of crosslinkers significantly impact the material properties of the resultant polymers. Specifically, the generated polyolefin vitrimers demonstrated excellent reprocessability and closed-loop recycling properties. The study in this work provides an efficient strategy to access various polyolefin vitrimers.

关 键 词：polyolefin vitrimers acetoacetate group polar monomer olefin copolymerization 

分 类 号：O631.5[理学—高分子化学]