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根据Friedel-Crafts反应机理,以氧化铝(AlCl_3)作为催化剂,使芳纶纤维(AF)表面与液体橡胶(LIR)的端羟基发生接枝反应,对接枝后的AF及芳纶增强天然橡胶(AF/NR)复合材料进行了SEM、DMA、力学性能等分析。结果表明:AlCl_3/LIR接枝体系处理后,复合材料的界面粘合性能和力学性能有明显提高,定伸应力提高了9.76%,撕裂强度提高了8.08%;随着AlCl_3浓度的增大,300%定伸应力呈逐渐增大的趋势,当浓度为2%时,300%定伸应力达到最大值5.66MPa,DMA结果显示:浓度为2%的AlCl_3处理过的AF较未经AlCl_3处理过的AF对应的AF/NR复合材料的储能模量最大值提高了25.4%,损耗模量峰值提高了14.7%,损耗因子峰值降低了10.0%。
According to the Friedel-Crafts reaction mechanism, aluminum oxide (AlCl 3) was used as a catalyst to make the surface of aramid fiber (AF) react with the terminal hydroxyl groups of liquid rubber (LIR) to graft grafted AF and aramid reinforced natural rubber (AF / NR) composites were analyzed by SEM, DMA, mechanical properties and other analysis. The results showed that the interfacial adhesion and mechanical properties of AlCl 3 / LIR grafted system were significantly improved, the tensile stress increased by 9.76% and the tear strength increased by 8.08%. With the increase of AlCl 3 concentration, 300% modulus of elasticity showed a trend of increasing gradually. When the concentration was 2%, the 300% modulus of elasticity reached the maximum of 5.66 MPa. DMA results showed that the concentration of 2% AlCl 3 -treated AF was higher than that without AlCl 3 treatment The maximum storage modulus of AF / NR composites increased by 25.4%, the peak of loss modulus increased by 14.7% and the peak of loss factor decreased by 10.0%.