Novel X-type polyester 5 containing 5-nitro-2,4-dioxybenzylidenecyanoacetate groups as nonlinear optical (NLO) chromophores, which constitute parts of the polymer backbone, was prepared and characterized. Polyester 5 is soluble in common organic solvents such as N,N-dimethylformamide and acetone. Polymer 5 shows a thermal stability up to 280°C from thermogravimetric analysis with glass-transition temperature obtained from differential scanning calorimetry of near 116°C. The second harmonic generation (SHG) coefficient (d 33 ) of poled polymer film at the 1064 nm fundamental wavelength is 1.78 pm V -1 . The dipole alignment exhibits a thermal stability even at 4°C higher than glass-transition temperature (T g ), and no significant SHG decay is observed below 120°C due to the partial main-chain character of polymer structure, which is acceptable for NLO device applications.
Novel X-type polyurethane 5 containing 4-(2 -carbomethoxy-2 -cyano)vinyl-6-nitroresorcinoxy groups as nonlinear optical (NLO) chromophores, which constitute part of the polymer backbone, was prepared and characterized. Polyurethane 5 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. It shows thermal stabilities up to 260 • C from thermogravimetric analysis with glass transition temperature obtained from differential scanning calorimetry near 108 • C. The second harmonic generation (SHG) coefficient (d 33 ) of poled polymer film at 1064 nm fundamental wavelength is 9.83 × 10 −9 esu. Polymer 5 exhibits a high thermal stability even at 2 • 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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