MODELING OF THE VISCOELASTIC BEHAVIOR OF AMORPHOUS THERMOPLASTIC GLASS-BEADS COMPOSITES BASED ON THE EVALUATION OF THE COMPLEX POISSONS RATIO OF THE POLYMER MATRIX

A series of polystyrene/glass beads composites were studied by using dynamic mechanical spectrometry. From experimental data obtained under isothermal conditions, a simulation method of viscoelastic behaviour of amorphous thermoplastics reinforced by glass beads was devised. Such a theoretical approach confirmed the requirement of considering the Poisson's ratio as a complex component over all the temperature range. This could be related to the difference of many powers of ten between the moduli of the two phases. Thus, we suggest in this paper a method to evaluate the complex Poisson's ratio of the matrix. FroM these results, the influence of filler content on the magnitude of the mechanical relaxation related to the glass transition is taken into account.