Birefringence study of drawn Nafion films
| Autor: | Peter Van Der Heijden, Faycal Bouzenad, Olivier Diat |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Tetramethylammonium
chemistry.chemical_classification Materials science Birefringence Polymers and Plastics chemistry.chemical_element Polymer Condensed Matter Physics chemistry.chemical_compound chemistry Nafion Polymer chemistry Materials Chemistry Lithium Physical and Theoretical Chemistry Counterion Composite material Deformation (engineering) Ionomer |
| Zdroj: | Journal of Polymer Science Part B: Polymer Physics. 42:2857-2870 |
| ISSN: | 1099-0488 0887-6266 |
| DOI: | 10.1002/polb.20153 |
| Popis: | Nafion films are birefringent. This optical property has been studied as a function of the draw ratio to obtain insight into the film morphology. At small draw ratios, the structure shows biaxial behavior. At higher draw ratios (>150%), Nafion can be considered to have a uniaxial symmetry. The influence on the birefringence of three different counterions (hydrogen, lithium, and tetramethylammonium) is negligible. Undrawn Nafion shows preorientation, which can be eliminated with drawing in the proper direction. X-ray experiments suggest that the physical origin of the birefringence in Nafion is mainly due to the orientation of the polymer chains and not due to deformation or form birefringence. |
| Databáze: | OpenAIRE |
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