Abstract
Novel Y-type polyurethane 3 containing 4-(4-nitrophenylazo)resorcinoxy groups as nonlinear optical (NLO) chromophores, which constitute part of the polymer backbone, was prepared and characterized. Polyurethane 3 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. It shows thermal stabilities up to 270°C from thermogravimetric analysis with glass transition temperature obtained from differential scanning calorimetry of 102°C. The second harmonic generation (SHG) coefficient (d 33) of poled polymer film at 1064 nm fundamental wavelength is 4.92 × 10−9 esu. Polymer 3 exhibits a high thermal stability even at 8°C higher than T g, and no significant SHG decay is observed below 110°C, which is acceptable for nonlinear optical device applications.
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