微动摩擦对聚合物自由体积的影响

摘要

采用正电子湮没方法对聚四氟乙烯、尼龙以及聚对苯二甲酸丁二醇酯材料微动摩擦后自由体积缺陷的变化规律进行了研究，结果表明，微动摩擦造成了材料内部平均自由体积尺寸增大，导致了材料的磨损及失效。%In this article, positron annihilation technique was used to study the free volume of PTFE, nylon and PBT after fretting, the result indicated that fretting caused the size of average free volume to increase and made polymer wear out and invalid.