Abstract Carbon fiber reinforced bismaleimide resin (CF/BMI) composites were recycled by chemical methods. The degradation of bismaleimide (BMI) resin was achieved in subcritical acetic acid. The C-N bonds of BMI resin were selectively cleaved by Ca(NO3)2. The results show that NO3− presents strong oxidizing ability in subcritical acetic acid and Ca2+ was beneficial to the oxidation of NO3−. The carbon fibers can be totally reclaimed from CF/BMI composites. The degradation products of BMI resin were partly carbonized due to the strong oxidation and high reaction temperature. However, the degradation products can be used to produce nitrogen doped carbon materials. The nitrogen doped carbon materials were used to catalyze the aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF). The work developed a promising strategy for the full-component recycling of waste CF/BMI composites.

中文翻译：

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碳纤维增强双马来酰亚胺树脂复合材料的化学降解回收碳纤维和氮掺杂碳材料

摘要 采用化学方法回收碳纤维增强双马来酰亚胺树脂（CF/BMI）复合材料。双马来酰亚胺（BMI）树脂的降解是在亚临界乙酸中实现的。BMI 树脂的 CN 键被 Ca(NO3)2 选择性裂解。结果表明，NO3-在亚临界乙酸中表现出较强的氧化能力，Ca2+有利于NO3-的氧化。碳纤维可以完全从 CF/BMI 复合材料中回收。BMI树脂的降解产物由于强氧化和高反应温度而部分碳化。然而，降解产物可用于生产掺氮碳材料。氮掺杂碳材料用于催化 5-羟甲基糠醛 (HMF) 有氧氧化为 2,5-二甲酰基呋喃 (DFF)。