FRICTION AND WEAR OF PTFE - A REVIEW
FRICTION AND WEAR OF PTFE - A REVIEW
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DOI：
10.1016/0043-1648(92)90039-b
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发表时间：
1992-10-15
期刊：
影响因子：
5
通讯作者：
VIJAYAN, K
中科院分区：
文献类型：
--
作者：
BISWAS, SK;VIJAYAN, K
聚四氟乙烯（PTFE）是一种重要的工程材料。当摩擦或滑动硬表面时，PTFE表现出低摩擦系数但高磨损率。聚合物的这些独特性质鼓励了对这种聚合物的摩擦和磨损过程进行许多机械和物理检查。这里回顾了过去30年来开展的一部分此类工作。当与硬表面摩擦时，PTFE链发生断裂，产生与配合面发生化学反应的活性基团。这导致强粘附力和连贯的转移膜。本体聚合物和转移膜之间的进一步相互作用引起晶胞的各向异性变形，这导致相邻链的紧密性和链之间的容易剪切。滑动导致位于本体聚合物的非常薄的次表面区域中的微晶的生长以及重新取向。这种结构重排促进了相邻排列的微晶的连接，以形成作为碎片出现的膜和带。
Polytetrafluoroethylene (PTFE) is an important engineering material. When rubbed or slid against a hard surface, PTFE exhibits a low coefficient of friction but a high rate of wear. These unique properties of the polymer have encouraged many mechanistic and physical examinations of the processes involved in the friction and wear of this polymer. A section of such work carried out over the past 30 years is reviewed here. When rubbed against a hard surface, the PTFE chain undergoes scission, creating active groups which chemically react with the counterface. This results in strong adhesion and a coherent transfer film. Further interaction between the bulk polymer and the transfer film gives rise to anisotropic deformation of the unit cell, which results in closeness of adjacent chains and easy shear between chains. Sliding brings about growth in as well as reorientation of crystallites situated in a very thin subsurface region of the bulk polymer. Such structural rearrangement facilitates the joining of adjacent aligned crystallites to form films and ribbons which emerge as debris.