Micro Raman and atomic force microscopy analysis of naturally aged polyethylene
| Autor: | Sz Matkó, A. Szép, Péter Anna, Gy. Marosi, Gy. Bertalan, István Csontos |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Atomic force microscopy Analytical chemistry Polymer Polyethylene Condensed Matter Physics symbols.namesake chemistry.chemical_compound Low-density polyethylene Crystallinity chemistry Mechanics of Materials Microscopy Materials Chemistry symbols Composite material Elongation Raman spectroscopy |
| Zdroj: | Polymer Degradation and Stability. 85:1023-1027 |
| ISSN: | 0141-3910 |
| DOI: | 10.1016/j.polymdegradstab.2003.05.004 |
| Popis: | The deterioration of naturally aged low-density polyethylene (LDPE) film was observed by elongation properties, DSC melting enthalpies and surface geometric characteristics by use of atomic force microscopy (AFM). The decrease of elongation at break under the influence of ageing was in good accordance with the increase of melting enthalpies and both phenomena could be explained by the gradual decrease of molecular mass of the polymer. On the wavy surface with a wavelength range of 10–15 μm, valleys with amplitudes from 160 to 600 nm could be observed by AFM depending on the time of ageing. The increase of deepness of valleys was explained not by the gradual erosion of the degraded surface but by the gradual increase of crystallinity, consequently the gradual shrinking on the surface of the polymer film. The gradual increase of crystallinity in the surface region of the film could be demonstrated by confocal Raman microscopy. |
| Databáze: | OpenAIRE |
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