Longitudinal volume viscosity of poly(methyl methacrylate)
| Autor: | F. Hurtado-Laguna, J. V. Aleman |
|---|---|
| Rok vydání: | 1988 |
| Předmět: |
Polymers and Plastics
Chemistry Organic Chemistry Young's modulus Volume viscosity Compression (physics) Poly(methyl methacrylate) Volumetric flow rate symbols.namesake chemistry.chemical_compound visual_art Materials Chemistry symbols visual_art.visual_art_medium Composite material Methyl methacrylate Glass transition Elastic modulus |
| Zdroj: | Journal of Polymer Science Part A: Polymer Chemistry. 26:2631-2649 |
| ISSN: | 1099-0518 0887-624X |
| Popis: | Volume flow of poly(methyl methacrylate) (PMMA) (Mn = 43,000 and Tg = 384) has been measured in an Instron Capillary Rheometer. Elastic modulus of the longitudinal wave, longitudinal volume viscosity, initial longitudinal volume viscosity, and retardation times are described at temperatures above Tg (418–483K) and compression rates of about 1.00–200.00 × 105 s−1. An initial increase followed by a decrease in longitudinal volume viscosity has been observed as the compression rate increases and the volume deformation decreases, this last behavior being at the lowest values of the compression rate (6.0 and 30.0 × 10−5 s−1) a typical nonequilibrium one. ηL also increases with increasing temperature (Tg decreases 0.18°C/MPa), and volume flow activation energy decreases as the volume deformation increases. |
| Databáze: | OpenAIRE |
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