The addition of polyamide veil (PAV) to the interlaminar area of carbon fiber (CF) fabric/epoxy composites can effectively increase their toughness with high accuracy. Vacuum-assisted resin infusion (VARI) was used to fabricate composite structures. VARI was applied to obtain a PAV, which is an interleaf between fabric piles of CFs. The thermoplastic PAV was dissolved in epoxy when the PAV was cured at high temperature. A phase-separated morphology with a PAV-rich secondary phase was formed during the curing process. Experimental results indicated that compression after impact (CAI), which is the average value of CAI, increased by threefold when two layers of PAV were added. The thermal and mechanical characteristics of the composite were analyzed and compared at room temperature and high-temperature wet conditions.

中文翻译：

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使用聚酰胺膜对 CFRP 复合材料进行层间增韧的微观结构、湿热和力学性能

在碳纤维 (CF) 织物/环氧树脂复合材料的层间区域添加聚酰胺面纱 (PAV) 可以有效地提高其韧性，并具有高精度。真空辅助树脂灌注 (VARI) 用于制造复合结构。VARI 用于获得 PAV，它是 CFs 织物绒头之间的夹层。当 PAV 在高温下固化时，热塑性 PAV 溶解在环氧树脂中。在固化过程中形成了具有富含 PAV 的第二相的相分离形态。实验结果表明，当添加两层 PAV 时，冲击后压缩 (CAI)，即 CAI 的平均值，增加了三倍。对复合材料在室温和高温湿条件下的热力学特性进行了分析和比较。