Abstract
A novel Y-type polyurethane 3 containing 4-(4-nitrophenylazo)catecholic groups as nonlinear optical (NLO) chromophores was prepared and characterized. Polyurethane 3 is soluble in common organic solvents such as acetone and DMF. Polymer 3 shows a thermal stability up to 270°C from TGA thermogram and the T g value obtained from DSC thermogram is around 96°C. The second harmonic generation (SHG) coefficient (d 33) of poled polymer film at 1064 nm fundamental wavelength is 4.58 × 10−9 esu. The dipole alignment exhibits a thermal stability even at 4°C higher than T g, and there is no SHG decay below 100°C due to the partial main-chain character of the polymer structure, which is acceptable for nonlinear optical device applications.
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