Abstract
Methyl 2,4-di-(2'-hydroxyethoxy)benzylidenecyanoacetate (3) was prepared and polymerized with terephthaloyl chloride to yield a novel Y-type polyester 4 containing 2,4-dioxybenzylidenecyanoacetate groups as NLOchromophores, which constituted parts of the polymer backbone. The resulting polymer 4 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. Polymer 4 showed thermal stability up to 280 <TEX>${^{\circ}C}$</TEX> in thermogravimetric analysis with glass-transition temperature obtained from differential scanning calorimetry near 108 <TEX>${^{\circ}C}$</TEX>. The second harmonic generation (SHG) coefficient (<TEX>$d_{33}$</TEX>) of poled polymer films at the 1064 nm fundamental wavelength was around <TEX>$3.54\;{\time}\;10^{-9}$</TEX> esu. The dipole alignment exhibited a thermal stability up to near <TEX>$T_g$</TEX> and no significant SHG decay was observed below 100 <TEX>${^{\circ}C}$</TEX> due to the partial main-chain character of polymer structure, which is acceptable for NLO device applications.
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