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Abstract
The method of deformation and harmonic analysis provided a basis for investigation of filled epoxy systems containing ED-5 and polyethylenepolyamine to determined the temperature and frequency dependences of the complex shear modulus and the phase angle between stress and deformation. The filler was a powder of the same ED-5 polymer, which made it possible for samples to be prepared with variations in their physical structure, while the chemical compositions of the samples remained identical. Experimental results were analyzed by the method of Williams-Landell-Ferry applying the concept of free volume. It was found that the free volume fraction of the polymer is not a constant at the glass transition temperature, and is a function of the physical structure of the polymer. It is seen that in the case of rigid network polymers the free volume theory with respect to glass transition processes retains its importance solely from a qualitative standpoint, but is unacceptable from a quantitative point of view.
Published Version
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