Synthesis and Electro-Optic Properties of Novel Polyester Containing Dioxybenzylidenecyanoacetate as a NLO-Chromophore

A novel polyester (4) containing dioxybenzylidenecyanoacetate group as a NLO-chromophore was prepared and characterized. Polyester 4 was soluble in common organic solvents such as acetone and DMSO. Polymer 4 showed thermal stability up to 280°C in TGA thermogram with T g value measured from DSC thermogram near 108°C. The SHG coefficient ( d 33 ) of poled polymer film at the 1064 nm fundamental wavelength was around 3.54 × 10−9 esu. The dipole alignment exhibited a thermal stability up to near T g and no significant SHG decay was observed below 95°C due to the partial main-chain character of polymer structure, which was acceptable for NLO device applications.