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Thermally stable nonlinear optical polyimide functionalized by N,N ‐diallylamino‐substituted chromophore
Author(s) -
Wu Wei,
Wang Dong,
Wang Peng,
Zhu Peiwang,
Ye Cheng
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 - 10.1002/1097-4628(20000923)77:13<2939::aid-app17>3.0.co;2-k
Subject(s) - polyimide , chromophore , poling , materials science , thermal stability , solubility , glass transition , polymer chemistry , curing (chemistry) , second harmonic generation , nonlinear optics , composite material , polymer , photochemistry , nonlinear system , chemistry , organic chemistry , optics , optoelectronics , layer (electronics) , laser , physics , quantum mechanics , dielectric , ferroelectricity
Thermally stable nonlinear optical (NLO) polyimide prepolymers with different chromophore‐loading levels were prepared through an addition reaction of bismaleimide 1 and N , N ‐diallylamino‐substituted chromophore 2. The prepolymers were used to prepare NLO polyimide in a simultaneously poling/curing process. These prepolymers exhibited excellent film‐forming quality and good solubility in low boiling‐point solvents. Kinetic parameters ( n , ln A , Ea ) of their solidification reaction were determined by the dynamic method. Thermal and NLO properties of the cured polyimides with various chromophore‐loading levels were studied. With increase of the chromophore‐loading level, the glass transition temperature ( T g ) and the thermal stability of the polyimides decreased, but the second‐order nonlinearity of the poled film increased. The largest d 33 coefficient obtained was 76.2 pm/V at 1064 nm. The SHG signal was rather stable up to 120°C. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2939–2947, 2000