Recovery processes in amorphous polymers
| Autor: | Jian Li, Teh-Ming Kung |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymethyl methacrylate Annealing (metallurgy) Mechanical Engineering Analytical chemistry Polymer Amorphous solid chemistry.chemical_compound chemistry Mechanics of Materials visual_art Stored energy Polymer chemistry visual_art.visual_art_medium General Materials Science Polystyrene Polycarbonate |
| Zdroj: | Journal of Materials Science. 22:3620-3630 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/bf01161470 |
| Popis: | The release of stored energy and the recovery of dimension and volume of cold compressed polystyrene (PS), polymethyl methacrylate (PMMA) and polycarbonate (PC) were studied. The release of stored energy has two peaks, one broad peak at 70° C (PS), 55° C (PMMA) and 85° (PC) and one sharp peak at 113° C (PS,T g = 105° C), 123° C (PMMA,T g = 117° C) and 157°C (PC,T g = 152° C). The recovery of dimension has only one peak at 114° C (PS), 124° C (PMMA) and 157° C (PC). This peak agrees very well with the second peak in the release of stored energy. The recovery of volume has a broad peak similar to the first peak in stored energy. Thus there are probably two recovery processes in these polymers: one releases energy and recovers volume belowT g and the other releases energy and recovers dimension aboveT g. These two processes are consistent with the two-stage formation mechanism of shear bands in amorphous polymers.[/p] |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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