新しいプロセスにより、強靭なポリマー複合材料から出発原料を完全に回収可能に(New process allows full recovery of starting materials from tough polymer composites)

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2024-02-08 オークリッジ国立研究所(ORNL)

オークリッジ国立研究所の科学者は、炭素繊維強化ポリマー(CFRP)の合成経路を設計し、すべての原料を回収できる閉ループ技術を開発しました。この技術は、従来のCFRPのリサイクルの難しさに対処し、軽量で強靭な材料の再利用を可能にします。新しい合成材料は、力学的特性に影響を与えることなく、複数の再処理サイクルを経ることができます。

<関連情報>

強靭でリサイクル可能な炭素繊維複合材料、調整されたビトリマー-繊維界面を介した卓越した界面接着性 Tough and recyclable carbon-fiber composites with exceptional interfacial adhesion via a tailored vitrimer-fiber interface

Md Anisur Rahman,Menisha S. Karunarathna,Christopher C. Bowland,… Dayakar Penumadu,Alexei P. Sokolov,Tomonori Saito
Cell Reports Physical Science  Published:November 20, 2023
DOI:https://doi.org/10.1016/j.xcrp.2023.101695

Highlights

•Dynamic covalent bonding enhances vitrimer-fiber interface for superior strength
•Exceptional interfacial adhesion is achieved by tailoring fiber-matrix interfaces
•Closed-loop recycling of CFRPs is achieved by interfacial dynamic cross-linking

Summary

Carbon-fiber-reinforced polymers (CFRPs) offer improved energy efficiency in aerospace and automobile applications due to lightweight and mechanical robustness but face challenges with limited recyclability and frequent fiber-polymer delamination caused by inadequate interfacial adhesion. Here, we report an effective design of tough and closed-loop recyclable carbon-fiber-reinforced vitrimers (CFRVs) with exceptional interfacial adhesion through the synergy of a boronic ester-modified commodity polymer, multidiol cross-linker, and diol-functionalized carbon fibers (CFs). The dynamic covalent bonding between the vitrimer and fiber interface results in 43% higher interfacial adhesion than that of CFRVs with pristine CFs. Moreover, CFRVs with diol-CFs exhibit ∼731-MPa tensile strength, 26% higher than unmodified CFRVs and 49% higher than conventional epoxy CFRPs. Importantly, the dynamic boronic ester exchange enables CFRV closed-loop recyclability, repairability, fast thermoformability, self-adhesion, and multicycle processability without compromising mechanical performance. The designed dynamic fiber-matrix interaction will open up a new paradigm of multifunctional CFRPs while providing a path toward closed-loop structural materials.

Graphical abstract

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