As the replacement of asbestos reinforced friction materials

poly-p-phenylene terephthalamide(PPTA) pulps have attracted wide attention. In this paper

the frictional properties of Kevlar pulps

Twaron pulps and the PPTA pulps manufactured by direct polycondensation in the authors’lab were investigated. The result showed that the compounds reinforced by these PPTA pulps all had excellent friction and wear properties. With the increase of temperature

the friction coefficient of the composition materials increased and the wear rate of the composition materials decreased.PPTA pulps in the friction materials overcome the shortcoming of asbestos that has high wear rate at high temperature.The frictional properties of the self made PPTA pulps were very close to those of Kevlar and Twaron pulps.There are good prospects in domestic production of friction materials reinforced by PPTA pulps.