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Synthesis and characterization of side‐chain polyimides for second‐order nonlinear optics via a post‐azo‐coupling reaction
Author(s) -
Liu YanGang,
Sui Yu,
Yin Jie,
Gao Jian,
Zhu ZiKang,
Huang DeYin,
Wang ZongGuang
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(20000418)76:3<290::aid-app3>3.0.co;2-a
Subject(s) - polyimide , azo coupling , side chain , glass transition , polymer chemistry , thermal stability , chromophore , materials science , moiety , azo compound , surface modification , solubility , mitsunobu reaction , covalent bond , condensation polymer , polymer , nonlinear optics , chemistry , organic chemistry , composite material , nonlinear system , layer (electronics) , physics , quantum mechanics
A two‐step, generally applicable synthetic approach for nonlinear optical (NLO) side‐chain polyimides was developed. This included the preparation of a preimidized, organosoluble polyimide with benzene moiety pendant from main chains, followed by the covalent bonding of the NLO chromophores onto the polyimide backbone via a post‐azo‐coupling reaction. The degree of functionalization of polyimides was estimated by UV‐VIS spectroscopy. The glass transition temperature ( T g ) of a polyimide decreased by only 10–20°C after the functionalization, which was much smaller than the decrease in T g when the chromophores were chemically bonded to the polyimide main chains through an ether linkage using a post‐Mitsunobu condensation. The solubility and thermal stability of polyimides were also studied. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 290–295, 2000