Abstract
A novel Y-type polyester 4 containing 5-methyl-4-{5-(1,2,2-tricyanovinyl)-2-thiazolylazo}resorcinoxy groups as nonlinear optical (NLO) chromophores was prepared and characterized. Polyester 4 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. It shows a thermal stability up to 250°C from thermogravimetric analysis thermogram with a glass-transition temperature (T g ) obtained from differential scanning calorimetry thermogram of around 94°C. The second harmonic generation (SHG) coefficient (d 33 ) of poled polymer film at 1064 nm fundamental wavelength is 8.12 × 10−9 esu. The dipole alignment exhibits a thermal stability even at 6°C higher than T g and there is no significant 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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