Influence of Frequency on Dynamic Mechanical Properties of Filled Polytetrafluoroethylene Matrix Composites

Abstract

Under severe service conditions, the dynamic mechanical properties of polymer matrix composites play a significant function in regulating the reliability of composite structures. In this article, the dynamic mechanical properties of polytetrafluoroethylene (PTFE) filled with 25 wt. % glass fibre (25GF), 25 wt. % carbon fibres (25CF) and 40 wt. % bronze fibre (40BF) under varying frequencies of 2.5, 5.0 and 10.0 Hz were studied. The dynamic mechanical testing was performed according to ASTM D 5023 standard. Cole-Cole-Cole plot has been applied to ascertain the phase behaviour of the composites. The dynamic mechanical analysis results revealed that varying (increasing) frequency significantly influenced storage and loss moduli, glass transition temperature and damping factor of the PTFE and its composites. Cole-Cole analysis revealed heterogeneity of the composite materials. The filled-PTFE composites can be used in advanced applications including aerospace and automobile sectors.