Dynamic Mechanical Analysis of PMMA-Cellulose Blends
| Autor: | A. S. Merenga, G. A. Katana |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Polymers and Plastics General Chemical Engineering Thermodynamics Dynamic mechanical analysis Activation energy Analytical Chemistry chemistry.chemical_compound chemistry Intramolecular force Polymer chemistry Curve fitting Relaxation (physics) Polymer blend Cellulose Glass transition |
| Zdroj: | International Journal of Polymeric Materials. 60:115-123 |
| ISSN: | 1563-535X 0091-4037 |
| DOI: | 10.1080/00914030903538553 |
| Popis: | Dynamic mechanical analysis (1–30 Hz, 274–414 K) is employed to study the inter- and intramolecular dynamics in a set of PMMA-CELL blends. Two relaxation processes are observed, the dynamic glass transition (α-relaxation) being characterized by WLF law and secondary transition (β-relaxation). The α-relaxation is strongly influenced by the composition of the blends and shows a rapid slowing down with increasing cellulose (CELL) intake. Increasing the content of the latter reduces the strength of the β-relaxation strongly and increases its activation energy by more than 60%. This proves that owing to the interactions between the cellulose hydroxyl group and PMMA ester group, the β-relaxation no longer has a local character only. By fitting the T g data for the blends to T g-composition models proposed by Gordon and Taylor and by Jenckel and Heusch, it is shown that the strength of the interaction increases strongly beyond 72% of CELL intake. |
| Databáze: | OpenAIRE |
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