Ultra-high-Tg chromophoric polyimides and polyureas as high-performance nonlinear optical materials

Lifeng Geng*, Jiafu Wang, Tobin Jay Marks, Weiping Lin, Haitian Zhou, Paul M. Lunquist, George K. Wong

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


Three approaches to the construction of high-Tg 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-β NLO chromophores using a Mitsunobu procedure yields, after poling and curing, a series of heavily crosslinked chromophoric polyimides with Tg values as high as 320°C and partially resonant X(2) responses as high as 1.0×10-7 esu (42 pm/V at 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°C and partially resonant X(2) values as high as 0.62×10-7 esu(25 pm/V at 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 X(2) on aging in air at 100°C for periods of 1,000-4,000 h. The imidazole based materials exhibit only about 10% X(2) decay on aging for 100 h at 200°C under N2.

Original languageEnglish (US)
Pages (from-to)135-146
Number of pages12
JournalMaterials Research Society Symposium - Proceedings
StatePublished - Jan 1 1996
EventProceedings of the 1995 MRS Fall Meeting - Boston, MA, USA
Duration: Nov 26 1995Dec 1 1995

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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