Abstract
New second-order nonlinear optical main-chain polymers have been synthesized in very high yields by a two-stage Knoevenagel polycondensation from 3,6-diformyl-9-heptylcarbazole and bis(cyanoacetate)s. In these main-chain polymers, two kinds of nonlinear optical (NLO) chromophores, carbazole with two acceptor groups and 4′-nitrophenylazoaniline, were introduced in a slipped shoulder-to-shoulder arrangament. All polymers were determined to be amorphous and to have glass transition temperatures in the range of 134–158°C by a differential scanning calorimeter. The chloroform soluble main-chain polymers show very high weight and number average molecular weights measured by a gel permeation chromatography. Thin films of the polymers could be obtained by a spin coating method. The orientation of dipoles could be achieved by applying an electric field. These poled films show good reasonable and stable second-order nonlinear optical responses.
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Zhang, Y., Wada, T., Wang, L. et al. Main-Chain Polymers with Nonlinear Optical Chromophores as a Slipped Shoulder-to-Shoulder Arrangement. Polym J 29, 685–692 (1997). https://doi.org/10.1295/polymj.29.685
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DOI: https://doi.org/10.1295/polymj.29.685