RESEARCH OF POLYMER COMPOSITE MATERIALS BASED ON POLYTETRAFLUOROETHYLENE AND CARBON FIBERS

YRCJIU

Abstract

This paper presents the results of the research of polymer composite materials based on polytetrafluoroethylene (PTFE) and modified carbon fibers of the Belum brand. It has been established that the introduction of 1 wt. % filler contributes to an increase in the deformation-strength characteristics of composites: tensile strength by 18%, relative elongation at break by 2% and elasticity modulus by 1.2 times compared to unfilled PTFE. The results of the research on compressive strength indicate that the introduction of a reinforcing filler generally has a positive effect on increasing the strength of the material: at 5% deformation by 50%; at 10% deformation by 41%; at 25% deformation by 38%. The tribological research showed that the wear resistance of composites has increased by 76 times, while maintaining the friction coefficient at the level of the original PTFE. In the micrographs of the samples obtained by scanning electron microscopy, tightly adhering fibers are observed on the surface of the composites, probably thus protecting the material from wear. In order to evaluate the interaction of the polymer matrix with the filler, researches were carried out using the method of differential scanning calorimetry. It is revealed that the higher the melting enthalpy, the more ordered (crystalline) system and the higher the wear resistance.