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采用浓H_2SO_4/浓HNO_3混合酸对碳纤维(CF)进行表面氧化处理得到氧化碳纤维(OCF),再利用γ-甲基丙烯酰氧丙基三甲氧基硅烷(KH-570)与OCF进一步反应得到KH-570接枝改性碳纤维(KCF),随后将其应用于乙烯-醋酸乙烯共聚物(EVA)复合泡沫材料中。利用FTIR、XPS、Raman、FESEM和电子万能试验机等考察了碳纤维的表面改性效果以及碳纤维/EVA复合材料的结构与性能。结果表明:氧化和接枝反应均可以增加碳纤维表面的活性官能团含量和粗糙度,从而改善碳纤维与EVA基体之间的相容性,使碳纤维/EVA复合泡沫材料的物理性能得到改善。相同条件下,KH-570接枝改性碳纤维/EVA复合泡沫材料的物理性能更优异。
The carbon fiber (CF) was oxidized by concentrated H_2SO_4 / concentrated HNO_3 mixed acid to obtain carbon fiber (OCF). The further reaction of γ-methacryloxypropyltrimethoxysilane (KH-570) with OCF gave KH -570 graft modified carbon fiber (KCF), which was subsequently used in ethylene-vinyl acetate copolymer (EVA) composite foam. The surface modification of carbon fiber and the structure and properties of carbon fiber / EVA composites were investigated by FTIR, XPS, Raman, FESEM and electronic universal testing machine. The results show that both the oxidation and grafting reaction can increase the content of active functional groups on the surface of carbon fiber and improve the compatibility between the carbon fiber and the EVA matrix and improve the physical properties of the carbon fiber / EVA composite foam. Under the same conditions, the physical properties of KH-570 grafted carbon fiber / EVA composite foam are more excellent.