Abstract
Some features of the behaviour of polymer materials under the conditions of plastic flow and uniaxial stretch are discussed. A combined action of high pressure and shear deformation leads to a drastic change of the physicochemical properties of solid polymer materials caused by the formation of a large free surface in the substance. In consequence, plastic flow of polymer materials may give rise, depending on the conditions of the experiment, either to monoliths with a more homogeneous structure or to highly disperse powders. An anomalous decrease of the deformability of some thermoplasts during uniaxial stretching has been observed in the premelting range; the decrease is caused by the nonhomogeneity of the structure of the material as a result of the enrichment of its amorphous disordered zones with low-molecular fractions.
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