Abstract
Methyl 3,4-di-(2'-hydroxyethoxy)benzylidenecyanoacetate (3) was prepared and condensed with terephthaloyl chloride to yield novel Y-type polyester (4) containing 3,4-dioxybenzylidenecyanoacetate groups as NLO-chromophores, which constituted parts of the polymer main chains. The resulting polymer 4 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. Polymer 4 shows thermal stability up to <TEX>$280^{\circ}C$</TEX> in thermogravimetric analysis with glass-transition temperature obtained from differential scanning calorimetry near <TEX>$105^{\circ}C$</TEX>. The second harmonic generation (SHG) coefficient (<TEX>$d_{33}$</TEX>) of poled polymer films at the 1064 nm fundamental wavelength is around 2.42 pm/V. The dipole alignment exhibits high thermal stability up to near <TEX>$T_g$</TEX>, and there is no SHG decay below <TEX>$100^{\circ}C$</TEX> due to the partial main-chain character of polymer structure, which is acceptable for NLO device applications.
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