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Synthesis of nonlinear optical polymers with large photoconductive sensitivity and transparency
Author(s) -
Pyun Seong Yong,
Moon Hyunsik,
Lee Jin Kyun,
Kim Nakjoong,
Park Soo Young
Publication year - 1999
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19991420108
Subject(s) - comonomer , materials science , polymer , poling , photoconductivity , chromophore , methyl methacrylate , monomer , copolymer , methacrylate , polymer chemistry , optoelectronics , photochemistry , chemistry , dielectric , composite material , ferroelectricity
Novel nonlinear optical (NLO) chromophore, 2‐{3‐[2‐(4‐methylsulfonylphenyl)vinyl]carbazol‐9‐yl}ethanol was synthesized and subsequently reacted with methacryloyl chloride to give a photoconducting NLO monomer ( M1 ). 2‐Methylacrylic acid 2‐[3‐(diphenylhydrazonomethyl)carbazol‐9‐yl]ethyl ester ( M2 ) was also synthesized as a comonomer to enhance the carrier mobility of the NLO polymer. Photoconducting NLO polymers, P1 and P2 were obtained by the copolymerization of Ml with methyl methacrylate and M2 , respectively. These polymers were well soluble in organic solvents and showed glass transition at 177 °C and 196 °C, respectively. Polymer films of P1 and P2 were optically clear, and were transparent at wavelengths longer than 420 nm. The electro‐optic coefficient (r 33 ) of poled P1 films was measured to be ∼5 pm/V at 632.8 nm. The photoconductive sensitivities of P1 and P2 were 6.2 × 10 −14 S·cm −1 /mW·cm −2 and 5.6 × 10 −11 S·cm −1 /mW·cm −2 .