Molecular Crystals and Liquid Crystals p. 119 - 127 (2004)
Update date:2022-08-03
Topics:
Lee, Ju-Yeon
Lee, Won-Jung
Park, Eun-Ju
Bang, Han-Bae
Baek, Chang Suk
2,5-Di-(2′-hydroxyethoxy)-4′-nitrostilbene (2) was prepared and condensed with 2,4-toluenediisocyanate, 3,3′-dimethoxy-4,4′- biphenylenediisocyanate and 1,6-hexamethylenediisocyanate to yield novel T-type polyurethanes 3-5 containing the NLO-chromophore 2,5-dioxynitrostilbenyl group, which constitutes a part of the polymer backbone. Polymers 3-5 were soluble in common organic solvents such as acetone and DMSO. Polymers 3-5 showed a thermal stability up to 280°C in TGA thermograms with Tgs of 79-159°C in DSC thermograms. The SHG coefficients (d33) of poled polymer films were around 5.4 × 10-9 esu, and they exhibited greater thermal stabilities of dipole alignments even at 10°C higher than T g due to the partial main chain character of the polymer structure. Copyright Taylor & Francis Inc.
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