Multifunctional Block Copolymers for Organic Photorefractive Materials

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  • Ogino Kenji
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology
  • Goma Teppei
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology
  • Kageyama Daisuke
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology
  • Sato Hisaya
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology
  • Yonezawa Noriyuki
    Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology

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Abstract

Photorefractive active block copolymers were successfully synthesized via an atom transfer radical polymerization of acrylate containing liquid crystalline moiety and hole transporting carbazole moiety. Resulting copolymers were characterized by gel permeation chromatography, NMR, and DSC. Copolymers afforded the transparent films showing birefringent nature. Photorefractive characteristics of copolymers with 2 wt% of trinitro- fluorenone as a photosensitizer were investigated by four wave mixing and two-beam coupling methods with a He-Ne laser. For the block copolymer, higher diffraction efficiency and larger coupling gain were observed compared with the corresponding statistical random copolymer.

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