【摘要】 利用多巴胺自聚合功能化纳米金刚石(ND),制备出聚多巴胺包覆纳米金刚石(D-ND),以克服ND自身聚集的缺点,并提高与环氧树脂基体的相容性。采用"淤浆复合法"制备了环氧树脂/D-ND纳米复合材料,由于聚多巴胺保留酚羟基,能在D-ND与环氧树脂基体之间构建较强的界面作用力。复合材料的拉伸强度提高12.22%,拉伸模量提高19.57%,伸长率提高38.37%。热分解温度提高了26℃、硬度提高25.15%,1%(wt)D-ND含量复合材料具有最好的摩擦学性能,摩擦系数降低11.36%,磨痕深度降低20.93%,磨损率降低37.67%。阐明了D-ND的加入对环氧树脂/D-ND纳米复合材料机械性能、热性能以及摩擦学等性能的影响,为环氧树脂改性提供了一种新的行之有效的方法。更多还原

【Abstract】 In order to solve the shortcoming of ND self-aggregation and improve the compatibility with epoxy resin matrix,polydopamine-coated nanodiamond(D-ND) was prepared by the functionalization of nanodiamond(ND) with dopamine self-polymerization. The epoxy resin/D-ND nanocomposites were prepared by the "slurry method". Because of the phenolic hydroxyl groups on the surface of polydopamine,the strong interfacial forces were built between D-ND and epoxy resin matrix. The tensile strength of the composites was increased by 12.22%, the tensile modulus was increased by 19.57%, and the elongation at the break was increased by 38.37%. The Thermal decomposition temperature was improved by 26 ℃, the hardness was increased by 25.15%, the composites with 1 wt% D-ND had the best tribological properties, the friction coefficient was reduced by 11.36%, the wear depth was reduced by 20.93% and the wear rate was reduced by 37.67%. The effect of adding D-ND on the mechanical properties, thermal properties and tribological properties of epoxy resin/D-ND nanocomposites was elucidated, which provided a new and effective method for the modification of epoxy resin.更多还原