相变微胶囊改性UHMWPE复合材料的摩擦学性能

以石蜡为囊芯,蜜胺树脂为高分子囊壁材料,采用原位聚合法制备了相变微胶囊,并将其作为填料添加入超高分子量聚乙烯基体中,制得相变微胶囊改性UHMWPE复合材料.分析了该复合材料的硬度和物相组成,并研究了其在室温,低速和高速试验条件下的摩擦磨损性能.结果表明:微胶囊填料的加入可以起到较好的减摩降磨作用,填料的最适宜添加比例为20%,在低速试验条件下经改性的复合材料摩擦系数较纯UHMWPE降低60%以上,高速试验条件下改性后的复合材料耐磨性较之纯UHMWPE有明显提高,不同试验条件下材料呈现不同的磨损机理.

The Tribological Properties of UHMWPE Composites Modified with Phase Change Microcapsules

A kind of microcapsule containing phase change material of paraffin wax was successfully prepared by process of in-situ polymerization using melamine resin as polymer shell material. Then it was added to the matrix of UHMWPE as the filler to prepare the UHMWPE-based composites. The hardness, phase composition and the tribological properties were investigated under both low-speed and high-speed test conditions at room temperature. The results show that the addition of microcapsules in the composites played a significant role in decreasing friction and reducing wear, and the optimum addition ratio of the microcapsules filler was 20% .The coefficient of friction of the modified composites decreased by 60% compared with that of pure UHMWPE under the low-speed test condition. While under the high-speed test condition, the wear resistance of the composites were improved obviously compared with that of the pure UHMWPE. The wear mechanism of the composites materials varied as different test conditions.