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摘要
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-temperature 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 conformational transitions due to the formation of "double-triple" folds in macromolecular chains can occur during the course of equal-channel multiple-angle extrusion.
- 出版日期2014-5
