Pockels-effect relaxation in poled side chain polymers: Decoupling of chromophor reorientation from α-relaxation
| Autor: | C. Baehr, Emiel G. J. Staring, Joachim H. Wendorff, B. Glüsen |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Chemistry Nonlinear optics Dielectric Polymer Chromophore Pockels effect Colloid and Surface Chemistry Chemical physics Polymer chemistry Materials Chemistry Side chain Relaxation (physics) Physical and Theoretical Chemistry Decoupling (electronics) |
| Zdroj: | Colloid & Polymer Science. 275:234-243 |
| ISSN: | 1435-1536 0303-402X |
| DOI: | 10.1007/s003960050077 |
| Popis: | The relaxation of the polar order of poled side chain polymers carrying NLO-active chromophores was monitored by Pockels-effect relaxation studies. Dielectric relaxation investigations were performed in order to analyze the coupling or decoupling of the chromophore reorientation to the relaxation modes of the side chain polymers. It was found that the chromophores perform their own reorientation relaxation mode both in the molten and the glassy state, which is not coupled to backbone relaxations. The chromophore reorientation process is characterized by a narrow distribution of the relaxation times and high activation energies. Studies on physical aging reveal that the chromophore reorientation is controlled by the free volume. The chromophore reorientation process can be influenced by the chemical linkage of the chromophore to the polymer backbone and by the nature of the backbone. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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