Volume 135, Issue 51 e202312638
Forschungsartikel

Neighboring Molecular Engineering in Diels–Alder Chemistry Enabling Easily Recyclable Carbon Fiber Reinforced Composites

Song Gu

Song Gu

The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064 China

Contribution: ​Investigation (lead), Methodology (equal), Writing - original draft (lead), Writing - review & editing (supporting)

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Yan-Fang Xiao

Yan-Fang Xiao

The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064 China

Contribution: ​Investigation (supporting)

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Shi-Huan Tan

Shi-Huan Tan

The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064 China

Contribution: ​Investigation (supporting)

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Dr. Bo-Wen Liu

Dr. Bo-Wen Liu

The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064 China

Contribution: ​Investigation (supporting), Supervision (supporting), Writing - review & editing (supporting)

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Dr. De-Ming Guo

Dr. De-Ming Guo

The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064 China

Contribution: Supervision (supporting), Writing - review & editing (supporting)

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Prof. Dr. Yu-Zhong Wang

Prof. Dr. Yu-Zhong Wang

The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064 China

Contribution: Funding acquisition (equal), Project administration (equal), Supervision (supporting), Writing - review & editing (supporting)

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Prof. Dr. Li Chen

Corresponding Author

Prof. Dr. Li Chen

The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064 China

Contribution: Funding acquisition (equal), Project administration (equal), Supervision (lead), Writing - original draft (supporting), Writing - review & editing (lead)

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First published: 27 September 2023

Abstract

Although a variety of dynamic covalent bonds have been successfully used in the development of diverse sustainable thermosetting polymers and their composites, solving the trade-off between recovery efficiency and comprehensive properties is still a major challenge. Herein, a “one-stone-two-birds” strategy of lower rotational energy barrier (Er) phosphate-derived Diels–Alder (DA) cycloadditions was proposed for easily recyclable carbon fiber (CF)-reinforced epoxy resins (EPs) composites. In such a strategy, the phosphate spacer with lower Er accelerated the segmental mobility and dynamic DA exchange reaction for network rearrangement to achieve high-efficiency repairing, reprocessing of the EPs matrix and its composites and rapid nondestructive recycling of CF; meanwhile, incorporating phosphorus-based units especially reduced their fire hazards. The resulting materials simultaneously showed excellent thermal/mechanical properties, superb fire safety and facile recyclability, realizing the concept of recycling for high-performance thermosetting polymers and composites. This strategy is of great significance for understanding and enriching the molecular connotation of DA chemistry, making it potentially applicable to the design and development of a wide range of dynamic covalent adaptable materials toward practical cutting-edge-tech applications.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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