Recyclable and Reprocessable Thermosetting Polyurea with High Performance Based on Diels-Alder Dynamic Covalent Crosslinking

编号 020031805

推送时间 20211122

研究领域 林产化工 

年份 2021 

类型 期刊 

语种 英语

标题 Recyclable and Reprocessable Thermosetting Polyurea with High Performance Based on Diels-Alder Dynamic Covalent Crosslinking

来源期刊 Macromolecular Research

期 第318期

发表时间 20210711

关键词 crosslinked polyurea;  recyclability;  Diels-Alder reaction;  mechanical property; 

摘要 Recyclable thermosets and thermoset composites with covalent adaptable networks (CANs, or dynamic covalent networks) have attracted considerable attention in recent years due to the combined merits of excellent mechanical and thermal properties, and chemical stabilities of traditional thermosets and recyclable, remoldable, and reprocessable attributes of thermoplastics. In this paper, we present an overview of the current strategies for synthesizing recyclable thermosets based on CANs, which involve recyclability, reprocessability, and possible rehealability. The recent literature examples are categorized based on the underlying controlled-cleavable linkages such as transesterification, DA/retro-DA chemistry, imine bonds, disulfide metathesis, dynamic B-O bonds, hemiaminals/hexahydrotriazines, and acetal linkages. Various degradation and malleability methods and resulting mechanical properties of the recycled thermosets and thermoset composites are presented. The emerging applications of recyclable thermosets and thermoset composites, with emphasis on their usage in adhesives, biomedical materials, wearable devices, coatings, and 3D printing materials, are also illustrated. Finally, a perspective on the challenges and future perspectives is briefly summarized.

服务人员 尚玮姣

服务院士 宋湛谦

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