Abstract
The mechanical and dynamic relaxation behaviour of model two-phase system poly(2-hydroxyethylmethacrylate)-glass beads was studied by means of an Instron machine and a free oscillating torsional pendulum. The effect of the filler content on the storage and loss moduli of composites could be described in terms of the modified Kerner equation in complex form. At temperature below the glass transition temperature of the matrix, the agreement between experimental and theoretical data was satisfactory after correction to thermally induced stress due to different thermal expansion coefficients of matrix and filler. In presence of filler the capacity of matrix to store and dissipate energy increases, but the character of molecular motions underlying the dispersion observed is preserved because the temperature of dispersions remains unchanged. Tensile properties and stress relaxation of these materials at different filler content have been studied below and above Tg both in the dry and the equilibrium water-swollen state.
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