Abstract
3,4-Di-(2′-hydroxyethoxy)benzylidenemalononitrile ( 3 ) was prepared and condensed with terephthaloyl chloride to yield novel Y-type polyester ( 4 ) containing the NLO-chromophores dioxybenzylidenemalononitrile group, which constituted parts of the polymer backbone. Polyester 4 is soluble in common organic solvents such as acetone and dimethylsulfoxide. Polymer 4 showed thermal stability up to 300°C in thermogravimetric analysis with glass-transition temperature (T g ) measured from differential scanning calorimetry around 91°C. The second harmonic generation (SHG) coefficient (d 33) of poled polymer films at the 1064 nm fundamental wavelength was around 4.39 × 10−9 esu. The dipole alignment exhibited high thermal stability up to T g due to the partial main-chain character of polymer structure, which is acceptable for NLO device applications.
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