芳纶纤维表面处理及其增强天然橡胶复合材料的研究

Study on the surface treatment of aramid fiber and its reinforced natural rubber composite

通过对芳纶纤维(AF)进行预处理达到改善纤维与橡胶的界面粘接状况。首先采用磷酸(H3PO4)对纤维进行刻蚀,然后再用多巴胺(DOPA)在纤维表面涂覆,并在此基础上对纤维进行接枝改性,制备芳纶纤维增强天然橡胶(NR)的复合材料(AF/NR复合材料)。红外光谱、扫描电子显微镜检测表明不同的处理方法均改善了纤维和复合材料的界面粘接。力学性能测试显示经硅烷偶联剂双-[γ-(三乙氧基硅)丙基]四硫化物(Si69)二次改性后的AF/NR复合材料的综合性能最好,100%定伸应力和撕裂强度达到最大值,分别为4.93MPa和95.94kN/m,与纯AF复合材料相比,分别提高了26.4%和13.9%。

Through the pretreatment of aramid fiber (AF)to improve the interfacial adhesion of fiber and rubber.Firstly phosphoric acid was etched on the fiber,and then the dopamine(DOPA)was coated on the surface of fiber.On the basis of fiber graft modifieation,aramid fiber reinforced natural rubber composite materials was prepared. Infrared spectroscopy,scanning electron microscope showed that different processing methods improved the interface adhesion of fiber and composite materials.The mechanical properties test showed that the composites with Si69 secondary modification had the best comprehensive performance,the modulus at 100%and tear strength reached the maximum,the modulus at 100%was 4.93MPa,and the tear strength was 95.94kN/m.Compared with pure aramid fiber composites,they increased by 26.4%and 13.9%,respectively.