Abstract
The effect of internal friction on the anisotropy of local relaxation properties (ALRP) of a polymer chain is studied by means of visco-elastic models of a chain with internal friction. The mean values of the cosines of the angle of rotation of an element orientated in the direction parallel to the axis of the monomer unit and of an element perpendicular to this axis, were taken as the relaxing quantities. The magnitude of the ALPR is expressed as the ratio of the relaxation times of these elements. It is shown that for a chain of a given thermodynamic rigidity, increase in friction brings about a decrease in the ALRP, while increase in chain rigidity increases the ALRP. Thus thermodynamic rigidity and internal friction exert an opposite effect on ALRP. The relationship between the change in the width and shape of the relaxation spectra, and the magnitude of the ALRP when the statistical and dynamic correlations in the polymer chain are altered, is discussed.
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