Multiply fully recyclable carbon fibre reinforced heat-resistant covalent thermosetting advanced composites

Yanchao Yuan (), Yanxiao Sun, Shijing Yan (), Jianqing Zhao, Shumei Liu, Mingqiu Zhang, Xiaoxing Zheng and Lei Jia
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Yanchao Yuan: College of Materials Science and Engineering, South China University of Technology
Yanxiao Sun: College of Materials Science and Engineering, South China University of Technology
Shijing Yan: College of Materials Science and Engineering, South China University of Technology
Jianqing Zhao: College of Materials Science and Engineering, South China University of Technology
Shumei Liu: College of Materials Science and Engineering, South China University of Technology
Mingqiu Zhang: Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-sen University
Xiaoxing Zheng: College of Materials Science and Engineering, South China University of Technology
Lei Jia: College of Materials Science and Engineering, South China University of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-11

Abstract: Abstract Nondestructive retrieval of expensive carbon fibres (CFs) from CF-reinforced thermosetting advanced composites widely applied in high-tech fields has remained inaccessible as the harsh conditions required to recycle high-performance resin matrices unavoidably damage the structure and properties of CFs. Degradable thermosetting resins with stable covalent structures offer a potential solution to this conflict. Here we design a new synthesis scheme and prepare a recyclable CF-reinforced poly(hexahydrotriazine) resin matrix advanced composite. The multiple recycling experiments and characterization data establish that this composite demonstrates performance comparable to those of its commercial counterparts, and more importantly, it realizes multiple intact recoveries of CFs and near-total recycling of the principal raw materials through gentle depolymerization in certain dilute acid solution. To our best knowledge, this study demonstrates for the first time a feasible and environment-friendly preparation-recycle-regeneration strategy for multiple CF-recycling from CF-reinforced advanced composites.

Date: 2017
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DOI: 10.1038/ncomms14657

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