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One‐pot synthesis of a new hyperbranched polyester containing 3,6‐di‐acceptor‐substituted carbazole chromophores for nonlinear optics
Author(s) -
Zhang Yadong,
Wang Liming,
Wada Tatsuo,
Sasabe Hiroyuki
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970221
Subject(s) - carbazole , chromophore , polymer chemistry , polyester , acceptor , materials science , nonlinear optics , nonlinear optical , photochemistry , polymer science , chemistry , nonlinear system , composite material , physics , condensed matter physics , quantum mechanics
The preparation of a new AB 2 monomer and a precursor of AB 2 monomer bearing carbazole chromophores is described. A new hyperbranched polymer containing carbazole substituted with two acceptor groups for nonlinear optical materials has been synthesized starting from the precursor of AB 2 monomer 3,6‐diformyl‐9‐(11‐hydroxyundecyl)carbazole via Knoevenagel condensation and ester exchange condensation in a one‐pot reaction. This hyperbranched polymer with a mass‐average molar mass of about 20000 g/mol is soluble in common organic solvents. The thin polymer films could be obtained from chloroform solution by spin coating. Differential scanning calorimetry analysis showed no crystalline transitions for this hyperbranched polymer and the glass transition temperature of the polymer is about 97,6°C. The resulting thin and glassy polymer films were shown to exhibit reasonably second harmonic generation efficiencies ( d 33 = 7 pm/V) after electric corona poling at about 100°C.