Tri-component Diels–Alder polymerized dendrimer glass exhibiting large, thermally stable, electro-optic activity
| Autor: | Alok A. Mistry, Larry R. Dalton, Yi Liao, Philip A. Sullivan, Andrew J. P. Akelaitis, Benjamin C. Olbricht |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | J. Mater. Chem.. 17:2899-2903 |
| ISSN: | 1364-5501 0959-9428 |
| DOI: | 10.1039/b701815k |
| Popis: | A novel, thermally curable, tri-component organic glass for electro-optic applications was designed and synthesized. The system employed the Diels–Alder cycloaddition reaction to effect efficient cross-linking. The first component was a dendrimer containing multiple electro-optic chromophore substituents surrounded by an outer periphery possessing diene functionality. The second was a furan-protected, bis-dienophile electro-optic chromophore, introduced in order to function as a nonlinear optically-active cross-linking agent. The initial glass-transition temperature of the material was tuned by the addition of the third component, an optically-inert, maleimide-based dienophile cross-linking agent. Tuning of this mixture allowed optimum poling temperature to coincide with optimum thermal conditions for promotion of the Diels–Alder cross-linking reaction. The electro-optic properties of the material were evaluated in real-time, using a reflection-based single-beam ellipsometry apparatus that was modified to perform in situ signal monitoring. The high electro-optic activity observed (r33 of 150 pm V−1), was thermally stable up to 130 °C (a 48 °C improvement over similar uncross-linked materials). After processing, materials were insoluble in acetone, retained 90% of their original r33 after 15 months at room temperature, and performed well in accelerated operational testing at 85 °C in air. |
| Databáze: | OpenAIRE |
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