Eun-Ju Park

Synthesis Of Novel T-Type Polyurethanes Containing 2,5-Dioxynitrostilbenyl Group As A Nlo Chromophore and Their Properties

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 polyurethanes3–5containing the NLO-chromophore 2,5-dioxynitrostilbenyl group, which constitutes a part of the polymer backbone. Polymers3–5were soluble in common organic solvents such as acetone and DMSO. Polymers3–5showed a thermal stability up to 280°C in TGA thermograms withTgs of 79–159°C in DSC thermograms. The SHG coefficients(d33)of poled polymer films were around 5.4 × 10−9esu, and they exhibited greater thermal stabilities of dipole alignments even at 10°C higher thanTgdue to the partial main chain character of the polymer structure.