A Microcalorimetric Study of Crystallizable Polymers
Subjected to Severe Plastic Deformation

V. A. Beloshenko^a,*, Yu. V. Voznyak^a, and V. M. Mikhal’chuk^b

^a Donetsk Institute of Physics and Engineering, National Academy of Sciences of Ukraine,
ul. Rozy Lyuksemburg 72, Donetsk, 83114 Ukraine

^b Donetsk National University, Universitetskaya ul. 24, Donetsk, 83001 Ukraine

*e-mail: bel@hpress.fti.ac.donetsk.ua

Received April 17, 2013;
Revised Manuscript Received December 12, 2013

Abstract—Differential scanning calorimetry has been used to investigate the evolution of the structural and
thermophysical parameters of a number of semicrystalline polymers (high-density polyethylene, polyamide-6,
polyoxymethylene) that is initiated by severe plastic deformation imposed through equal-channel multiple-
angle extrusion. Thermograms of the deformed polymers have been found to exhibit an additional high-tem-
perature melting peak. It has been shown that the onset, maximum, and end temperatures for both melting peaks
increase with the strain buildup. The degrees of crystallinity and the thicknesses of crystallites increase as well.
The magnitude of the effects is determined by the deformation route selected. It has been revealed that confor-
mational transitions due to the formation of “double–triple” folds in macromolecular chains can occur during
the course of equal-channel multiple-angle extrusion.

DOI: 10.1134/S0965545X1403002X

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