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S. ARORA1,* , S. KUMAR2
Polyurethanes with different feed concentrations of 4-[bis (2-hydroxyethyl) amino]-44 '-formylazobenzene as dipolar chromophore have been synthesized and characterized using GPC, IR, 1H NMR, UV/Vis absorption spectroscopic technique, DSC and TGA techniques. The resulting polymeric materials possess good solubility in polar aprotic solvents, high Tg and high thermal stability. The vacuum-deposited thin films of synthesized polyurethanes were corona-poled to orient the dipolar chromophores in proper direction. To investigate the potential of these materials for practical applications, the temporal stability of aligned dipoles has been studied at room temperature as well as at elevated temperatures. The results suggest only 4.5-6 % decay of polar order at room temperature even after 2 months of poling under the conditions (5 kV, 210 °C, 30 min.). The temporal stability of dipole orientation was found to increase on decreasing the feed concentration of dipolar chromophore.
Polyurethane, Dipolar chromophore, Thin film, Corona Poling, Relaxation behaviour, Temporal Stability.
S. ARORA, S. KUMAR, Relaxation behavior of dipolar chromophore in coronapoled vacuum-deposited polyurethane thin films, Optoelectronics and Advanced Materials - Rapid Communications, 2, 6, June 2008, pp.360-365 (2008).
Submitted at: May 3, 2008
Accepted at: June 5, 2008
Optoelectronics and Advanced Materials - Rapid Communications
(2024): Impact Factor = 0.4 - Journal Citation Reports (Clarivate Analytics, 2025)
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