Abstract
3,4-Di-(2'-hydroxyethoxy)-4'-nitrostilbene (2) was prepared and condensed with 2,4-toluenediisocyanate and 3,3'-dimethoxy-4,4'-biphenylenediisocyanate to yield polyurethanes 3 and 4 containing the NLO-chromophore dioxynitrostilbenyl group. Polymers 3-4 were soluble in common organic solvents. Polymers 3-4 showed a thermal stability up to 300°C in TGA thermograms with T g values in the range of 109-114°C in DSC thermograms. The SHG coefficients (d 33 ) of poled polymer films were around 3.2×10 −9 esu.
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