Synthesis and optical properties of polyurethanes containing a highly NLO active chromophore

Han Young Woo, Hong Ku Shim, Kwang Sup Lee

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Two types of new polyurethanes with a highly NLO active chromophore, 2-[4-[4-[bis(2-hydroxyethyl)amino]phenylazo]benzylidene]malonitrile (HAPM), in the polymer side chain were synthesized (PU1-DCN and PU2-DCN) and characterized. The diisocyanate components of the polymers are 2,4-tolylene diisocyanate and 3,3′-dimethoxybiphenyl-4,4′-ylene diisocyanate. The molecular weights of PU1-DCN and PU2-DCN were determined to be M̄w = 23000 (M̄w/M̄n = 2.19) and M̄w = 22000 (M̄w/M̄n = 2.34), respectively. The final products are readily soluble in polar aprotic organic solvents, like tetrahydrofuran, N,N-dimethyl-formamide, cyclohexanone, etc. Good optical quality films were obtained by spin coating. The glass transition temperatures of both polymers were found to be 158-159°C. They showed no melting points in the DSC curves, suggesting an amorphous phase. It was found that the electro-optic coefficient of PU1-DCN was r33 = 62.7 pm · V-1 at 633 nm wavelength. The macroscopic second-order hyperpolarizability at 1064 nm wavelength was determined to be χ(2) = 136 pm · V-1 for PU1-DCN and χ(2) = 120 pm · V-1 for PU2-DCN.

Original languageEnglish
Pages (from-to)1427-1433
Number of pages7
JournalMacromolecular Chemistry and Physics
Volume199
Issue number7
DOIs
Publication statusPublished - 1998 Jul

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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