Elastomeric polyolefin vitrimer: Dynamic imine bond cross-linked ethylene/propylene copolymer

编号 020031601

推送时间 20211108

研究领域 林产化工 

年份 2021 

类型 期刊 

语种 英语

标题 Elastomeric polyolefin vitrimer: Dynamic imine bond cross-linked ethylene/propylene copolymer

来源期刊 Polymer

期 第316期

发表时间 20210711

关键词 Vitrimer;  Ethylene/propylene copolymer;  Reversible cross-linking; 

摘要 In this study, a new strategy for the preparation of elastomeric vitrimer based on ethylene/propylene?copolymer?rubber (EPR) was proposed. Specifically, by introducing?aldehyde?pendants into EPR chains and then adding tris-(2-aminoethyl) amine (TREA) as cross-linking agent, an associative reversible cross-linking network based on dynamic imine bond was constructed in EPR. Since the imine exchange reaction can be controlled by adjusting the temperature without catalyst, the EPR reversible cross-linking was realized efficiently in solid polymers. Moreover, the cross-linking density as well as the material mechanical properties could be tuned by simply varying the aldehyde group content or the aldehyde/TREA ratio. The association nature of the dynamic imine bond enabled the cross-linked EPR to maintain the network structure in?xylene?at 120?°C; while the imine bond exchange reaction rate accelerated as the temperature increased. The?activation energy?of the cross-linking reaction was calculated to be 57.2?kJ?mol?1?according to the dependence of the imine bond exchange reaction rate on temperature, which also endowed the cross-linked network with satisfactory plasticity and recyclability.

服务人员 尚玮姣

服务院士 宋湛谦

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