Abstract
A novel T-type polyurethane 7 containing 1-(2,5-dioxyphenyl)-2-(5-(1,2,2-tricyanovinyl)-2-thienyl)ethenes as NLO chromophores, which constitute part of the polymer backbone, was prepared. Polyurethane 7 is soluble in common organic solvents such as DMF and DMSO. It shows a thermal stability up to <TEX>$270^{\circ}C$</TEX> from TGA thermogram with <TEX>$T_g$</TEX> value obtained from DSC thermogram near <TEX>$155^{\circ}C$</TEX>. The second harmonic generation (SHG) coefficient (<TEX>$d_{33}$</TEX>) of poled polymer film at 1560 nm fundamental wavelength is <TEX>$3.56{\times}10^{-9}$</TEX> esu. Polymer 7 exhibits a thermal stability even at <TEX>$5^{\circ}C$</TEX> higher than <TEX>$T_g$</TEX>, and no significant SHG decay is observed below <TEX>$160^{\circ}C$</TEX>, which is acceptable for nonlinear optical device applications.
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