Determination of dynamic mechanical properties of engineering thermoplastics at wide frequency range using Havriliak-Negami model

摘要

Using Havriliak-Negami (HN) model of time-temperature superposition, dynamic mechanical properties for two thermorheologically simple engineering thermoplastics, viz., polyether ether ketone (PEEK) and polycarbonate (PC) were determined. Calculations have been made with respect to (i) temperature-independent HN parameters from dynamic mechanical analysis (DMA) and (ii) activation energies of the deformation processes involved. Viscoelastic properties, over a wide frequency range, were predicted from the HN model, which were further correlated with the experimentally determined quantities and chemical structure of the polymers. The mathematical calculations were done using Matlab (R) software. (c) 2006 Wiley Periodicals, Inc.