The utilization of carbon fiber reinforced epoxy resin (CFRE) has gained remarkable prominence across diverse industrial domains due to its excellent rigidity, hardness, and corrosion resistance. However, the intricate three-dimensional network cross-linked structure of thermosetting epoxy resin engenders formidable challenge in the realm of material recycling for further value-added products. In this paper, solid-state shear milling (S3M) technology is applied to removal of the epoxy resin matrix enshrouching the carbon fiber surface, facilitating the subsequent fabrication of value-added PA/WFRE/BN composite through the incorporation of boron nitride (BN). The BN engenders a progressive connection with the high aspect ratio carbon fiber and established cohesive thermal conductivity network. Specifically, the thermal conductivity of PA/WFRE/BN-20 reached 1.24 W/mK escalated by an impressive 375% vs pristine polyamide (PA), and resistivity is higher than 10¹⁰ Ω•cm. An excellent thermal management performance can also be noticed for PA/WFRE/BN-20 composite, whose surface temperature drops from 60 to 20 °C in only 55 s, which is much shorter than PA/BN-20 (almost 100 s). Furthermore, the tensile and flexural strengths of the composite reached as high as 88.6 and 127.7 MPa, which are 76% and 93% higher than pristine PA. In summation, this work offered a facile pathway for the fabrication of value-added thermal management composites from waste carbon fiber reinforced epoxy and showed a promising strategy for the upgrade recycling of thermosetting resins.

中文翻译：

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用于热管理应用的碳纤维增强聚合物的升级回收

碳纤维增强环氧树脂（CFRE）因其优异的刚性、硬度和耐腐蚀性而在各个工业领域得到了显着的应用。然而，热固性环氧树脂复杂的三维网络交联结构在材料回收领域为进一步增值产品带来了巨大的挑战。本文采用固态剪切研磨（S3M）技术去除覆盖碳纤维表面的环氧树脂基体，通过掺入氮化硼（BN），有利于后续制备增值PA/WFRE/BN复合材料。 ）。 BN 与高长径比碳纤维形成渐进式连接，并建立内聚导热网络。具体而言，PA/WFRE/BN-20 的热导率达到 1.24 W/mK，与原始聚酰胺 (PA) 相比提高了 375%，电阻率高于 10 ¹⁰ Ω·cm。 PA/WFRE/BN-20复合材料也具有优异的热管理性能，其表面温度仅在55秒内从60°C降至20°C，这比PA/BN-20（近100秒）要短得多。此外，复合材料的拉伸强度和弯曲强度分别高达88.6和127.7 MPa，分别比原始PA高76%和93%。总之，这项工作为利用废弃碳纤维增强环氧树脂制造增值热管理复合材料提供了一条简便的途径，并为热固性树脂的升级回收提供了一种有前景的策略。