Inelastic deformation of glassy polyaryleneetherketone: Energy accumulation and deformation mechanism
| Autor: | S. N. Salazkin, E. F. Oleinik, V. Afonicheva, Vera V. Shaposhnikova, Krasnov Aleksandr P, O. B. Salamatina, S. N. Rudnev |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Polymers and Plastics Strain (chemistry) Internal energy 02 engineering and technology Calorimetry Plasticity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Condensed Matter::Soft Condensed Matter Condensed Matter::Materials Science chemistry.chemical_compound chemistry Deformation mechanism visual_art Materials Chemistry visual_art.visual_art_medium Polystyrene Deformation (engineering) Composite material Polycarbonate 0210 nano-technology |
| Zdroj: | Polymer Science Series A. 58:18-32 |
| ISSN: | 1555-6107 0965-545X |
| DOI: | 10.1134/s0965545x16010107 |
| Popis: | The plastic deformation of glassy non-annealed polyaryleneetherketone (PAEK) was investigated via deformation calorimetry and thermally stimulated recovery of residual strain. Polymer samples were deformed at room temperature under uniaxial compression up to e def =–(40−50)% at a rate of 0.04 min−1. It was found that PAEK behaves in the deformation process similarly to many other glassy polymers: It stores internal energy excess at loading and contains two types of different inelastic strain carriers, namely the delayed elastic (e de) and plastic (e pl) strain carriers. The maximum level of the accumulated energy in PAEK reaches ≈ 8.3 J/g, which is close to those for glassy polystyrene and polycarbonate. Nearly all the deformation energy stored in PAEK is carried by the delayed-elastic strain. The carriers of plastic strain carry no extra energy or a very small amount of it. The inelastic deformation of glassy PAEK proceeds in two stages. The carriers of e de are nucleated at the first stage of the deformation process, and the carriers of e pl are nucleated at the second stage. It was shown that, during glassy-polymer loading, the molecular level structures carrying e pl never appear by themselves, but appear only as a result of spontaneous reorganization of e de. In other words, the plastic deformation appears in PAEK owing to the two-step process. This situation is typical for all glassy polymers. |
| Databáze: | OpenAIRE |
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