多巴胺改性硅炭黑增强橡胶复合材料性能

Performance of dopamine modified silicon carbon black reinforced rubber composite

以15份稻壳制得的硅炭黑(SiCB)为基础,详细研究了经多巴胺(DA)改性的SiCB作为填料对天然橡胶/丁二烯橡胶(NR/BR)复合材料性能的影响。在SiCB表面接枝聚多巴胺(PDA)涂层后,不仅提高了SiCB的表面活性,促进了SiCB的分散,而且有效地解决了SiCB与基体相容的问题,极大提高了两者的界面作用力,使橡胶复合材料的机械性能得到有效提高。结果表明:经多巴胺改性的填料,通过机械共混制得的NR/BR/PDA-SiCB性能得到了很大提高,较NR/BR/SiCB复合材料,其拉伸强度提高了60.6%,断裂伸长率提高了29%,松弛强度也得到明显提高,玻璃化转变温度(T;)提高2.16℃,热稳定性也到得相对提高。

Based on 15 phr of silicon carbon black(SiCB)made from rice husk,the effect of dopamine(DA)modified SiCB as a filler on the properties of natural rubber/butadiene rubber(NR/BR)composites was studied in detail.After grafting polydopamine(PDA)coating on the surface of SiCB,it not only improve the surface activity of the filler,promotes the dispersion of the filler,but also effectively solves the problem of compatibility between the filler and the matrix,greatly improves the interfacial force between the two,and effectively improves the mechanical properties of rubber composites.The results show that the performance of the NR/BR/PDA-SiCB prepared by mechanical blending of the dopamine-modified filler has been greatly improved.Compared with the NR/BR/SiCB composites,its tensile strength is increased by 60.6%,and the elongation at break has been increased by 29%,the relaxation strength has also been significantly improved,the glass transition temperature(Tg)has increased by 2.16°C,and the thermal stability has also been relatively improved.