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Second Order Nonlinear Optical Performances of Polymers Containing Imidazole and Benzimidazole Chromophores
Author(s) -
Carella Antonio,
Centore Roberto,
Sirigu Augusto,
Tuzi Angela,
Quatela Alessia,
Schutzmann Stefano,
Casalboni Mauro
Publication year - 2004
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.200400129
Subject(s) - chromophore , benzimidazole , polymer , imidazole , relaxation (psychology) , nonlinear optical , condensation , chemistry , nonlinear optics , polymer chemistry , second harmonic generation , thermal stability , materials science , photochemistry , optics , stereochemistry , nonlinear system , organic chemistry , physics , psychology , social psychology , laser , quantum mechanics , thermodynamics
Summary: Condensation polymers based on two different NLO‐active chromophores, namely 2‐[4‐[(4‐ N , N ‐dihydroxyethylamino)phenylazo]phenyl]‐5(6)‐nitrobenzimidazole (BZI) and 2‐[4‐(4‐ N , N ‐dihydroxyethylamino)phenylazo]‐4,5‐dicyanoimidazole (IMI), have been synthesized and their basic properties measured. The second order NLO properties of poled polymers were investigated by SHG procedures at different temperatures (35, 65 and 85 °C) and exposure times. Resonance free d 33 coefficients ( λ = 1 368 nm) took values in the range 1.8–4.0 pm · V −1 , but the time stability of their SHG signal was fairly acceptable, particularly for the high T g (e.g. 188 °C) polymer for which a relaxation time (at 25 °C) of 2.8 years has been determined.BZI and IMI chromophores.