Thermal behavior of crystalline and amorphous HDPE phase in the process of necking at creep deformation
| Autor: | S.N. Chvalun, M.A. Shcherbina, N.P. Bessonova, S.V. Krasheninnikov |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Slip-link model
Materials science Polymers and Plastics Organic Chemistry Deformation calorimetry 02 engineering and technology Deformation (meteorology) 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Amorphous solid TP1080-1185 Deformation mechanism Creep Polymer networks Stress relaxation Polyolefines Lamellar structure Polymers and polymer manufacture Crystallite Composite material 0210 nano-technology Necking |
| Zdroj: | Polymer Testing, Vol 97, Iss, Pp 107127-(2021) |
| ISSN: | 0142-9418 |
| DOI: | 10.1016/j.polymertesting.2021.107127 |
| Popis: | Thermodynamic aspect plays an important role in the structural processes in the neck of partially crystalline polymers under tension. Method of deformation calorimetry, simultaneously recording thermal and mechanical effects allows quantitative determination of entropic and energy effects during deformation. Evaluation of such parameters in combination with structural analysis provides important information for the analysis of the deformation mechanism of various polymer systems. It was revealed that the change in internal energy is due to the contributions of several processes: the destruction of the initial lamellar structure, the formation of a "neck" (lamellae-fibrillae transition), and the formation and deformation of fibrilae. The stretching of partially crystalline polymers in an amorphous state promotes crystallization. The chains in the formed crystallites are oriented along the axis of action of the applied force. The growth of crystallites is accompanied by straightening of the folded sections of the chains, which causes stress relaxation or rapid elongation of the sample when tested for creep. |
| Databáze: | OpenAIRE |
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