Properties of ultrahigh-Tg chromophoric polyimides and polyureas as high-performance nonlinear optical materials: architecture-processing-temporal stability relationships

Lifeng Geng; Jennifer F. Wang; Tobin J. Marks; Weiping Lin; Paul M. Lundquist; George K. Wong

doi:10.1117/12.219562

15 September 1995 Properties of ultrahigh-Tg chromophoric polyimides and polyureas as high-performance nonlinear optical materials: architecture-processing-temporal stability relationships

Lifeng Geng, Jennifer F. Wang, Tobin J. Marks, Weiping Lin, Paul M. Lundquist, George K. Wong

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Proceedings Volume 2528, Optical and Photonic Applications of Electroactive and Conducting Polymers; (1995) https://doi.org/10.1117/12.219562
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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, Jennifer F. Wang, Tobin J. Marks, Weiping Lin, Paul M. Lundquist, and 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); https://doi.org/10.1117/12.219562

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