Spectral Interpretation of Relaxation Processes of Polymer Fiber Materials

The distribution of relaxation times in polymeric fibrous materials was studied on the basis of a mathematical model of the relaxation process. The relaxation times characterize the times of transition of the "relaxing" particles of the polymer macromolecules from one stable energy state to another. The character of such transitions is due both to the rheology of the polymeric material and to the magnitude of the applied deformation or load. It can be explained, on the one hand, by conformational energy transitions within the macromolecules of the material when their shape changes during rearrangement and, on the other, by shifts of the macromolecules in relation to each other or by other changes caused by energy changes.