Multiple transitions in isotactic polypropylene around and above the glass transition
| العنوان: | Multiple transitions in isotactic polypropylene around and above the glass transition |
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| المؤلفون: | G. Nemoz, D. Chatain, Colette Lacabanne, B. Chabert, M. Jarrigeon |
| المصدر: | Journal of Macromolecular Science, Part B. 17:1-24 |
| بيانات النشر: | Informa UK Limited, 1980. |
| سنة النشر: | 1980 |
| مصطلحات موضوعية: | Polypropylene, Materials science, Polymers and Plastics, Relaxation (NMR), Thermodynamics, General Chemistry, Activation energy, Condensed Matter Physics, Thermal expansion, Condensed Matter::Materials Science, chemistry.chemical_compound, chemistry, Phase (matter), Tacticity, Materials Chemistry, Composite material, Glass transition |
| الوصف: | Gas chromatography, thermal expansion, dynamic mechanical relaxation and thermally stimulated current measurements were used to study multiple transitions in isotactic polypropylene. The crystalline phase relaxation Tαc was decomposed into two components, Tαc1 and Tαc1, in order of decreasing temperature. The activation energy of the Tαc mode was found to be lower than that of the relaxation observed around the glass transition temperature. Thermally stimulated current (TSC) measurements revealed the existence of an apparent double liquid-liquid transition at 39°C and 68 °C in undrawn polypropylene and at 28°C and 55°C in drawn polypropylene. These TSC peaks correspond to a relaxation time following a Vogel equation whose critical temperatures let us predict an apparent double glass transition in polypropylene. |
| تدمد: | 1525-609X 0022-2348 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::31f73b0d3dab6c4af2cf8e9275a641f4 https://doi.org/10.1080/00222348008212795 |
| رقم الأكسشن: | edsair.doi...........31f73b0d3dab6c4af2cf8e9275a641f4 |
| قاعدة البيانات: | OpenAIRE |
PDF full text from Publisher | تدمد: | 1525609X 00222348 |
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