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针对碳纤维增强乙烯基酯树脂(CF/VE)复合材料界面性能薄弱的问题,通过热氧-接枝的方法对碳纤维表面进行改性,通过添加偶联剂改性树脂,并采用真空辅助成型工艺制备了CF/VE复合材料。通过纤维扫描电镜(SEM)表征和CF/VE复合材料力学性能测试、动态力学测试、界面粘结参数计算以及界面的微观表征验证改性方法的效果。SEM测试表明改性后纤维比表面积和粗糙度提高;TGA测试表明碳纤维氧化温度大于210℃,且氧化温度在600℃时,CF/VE复合材料综合性能最佳;CF/VE复合材料界面性能随隅联剂质量浓度的增大先提高后降低,且在其质量浓度为1%时,层间剪切强度最大,相对于未改性CF/VE复合材料的提高了74.3%;动态力学性能测试(DMA)表明改性CF/VE复合材料的玻璃化转变温度Tg较未改性的提高了约10℃;界面粘结参数A和α的定量计算表明改性CF/VE复合材料界面性能得到较大改善。
Aiming at the weak interface property of CFRP composite, the surface of carbon fiber was modified by hot oxygen-grafting method, the resin was modified by adding coupling agent and vacuum assisted forming process A CF / VE composite was prepared. The effect of the modified method was verified by SEM, characterization of the mechanical properties of CF / VE composites, dynamic mechanical tests, calculation of interfacial adhesion parameters and microscopic characterization of the interface. The SEM results showed that the specific surface area and roughness of the modified fibers increased. The TGA test showed that the CF / VE composites had the best overall performance when the oxidation temperature of carbon fiber was more than 210 ℃ and the oxidation temperature was 600 ℃. The interfacial properties of CF / The increase of the concentration of the compound agent firstly increases and then decreases, and at the mass concentration of 1%, the interlaminar shear strength is the highest, which is increased by 74.3% compared with that of the unmodified CF / VE composite. The dynamic mechanical property test (DMA) showed that the glass transition temperature Tg of the modified CF / VE composite was about 10 ℃ higher than that of the unmodified one. Quantitative calculation of the interfacial adhesion parameters A and α showed that the interfacial properties of the modified CF / VE composite were better than those of the unmodified Great improvement.