15 September 1995 Properties of ultrahigh-Tg chromophoric polyimides and polyureas as high-performance nonlinear optical materials: architecture-processing-temporal stability relationships
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Abstract
Three complementary approaches to the construction of electric field polable high-Tg (glass transition temperature) polyimides and polyureas as second-order NLO materials are discussed. In the first approach, copolymerization of bismaleimides with o,o'- diallylbisphenol A followed by functionalization with high-(beta) NLO chromophores using a Mitsunobu procedure yields, after poling and curing, a series of heavily crosslinked chromophoric polyimides with Tg values as high as approximately 260 degree(s)C and (chi) (2) responses as high as 1.0 X 10-7 esu (42 pm/V at (lambda) o equals 1064 nm, 1.17 eV). In the second two approaches, copolymerization of the chromophore 4,5-bis(4'aminophenyl)-2-(4'-nitrophenyl)imidazole with bismaleimides or diisocyanates yields polyimides and polyureas with Tg values as high as 292 degree(s)C and partially resonant (chi) (2) values as high as 0.62 X 10-7 esu (25 pm/V at (lambda) o equals 1064 nm). It is found that careful attention to the details of curing and crosslinking during poling results in NLO-active matrices exhibiting negligible decay in (chi) (2) on aging in air at 100 degree(s)C for periods of 1000 - 4000 h. The imidazole- based materials exhibit only approximately 10% (chi) (2) decay on aging for 100 h at 200 degree(s)C under N2.
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Lifeng Geng, Lifeng Geng, Jennifer F. Wang, Jennifer F. Wang, Tobin J. Marks, Tobin J. Marks, Weiping Lin, Weiping Lin, Paul M. Lundquist, Paul M. Lundquist, George K. Wong, George K. Wong, } "Properties of ultrahigh-Tg chromophoric polyimides and polyureas as high-performance nonlinear optical materials: architecture-processing-temporal stability relationships", Proc. SPIE 2528, Optical and Photonic Applications of Electroactive and Conducting Polymers, (15 September 1995); doi: 10.1117/12.219562; https://doi.org/10.1117/12.219562
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