Characterization and structure of side-on azo copolymers in Langmuir-Blodgett films

Jian Jin, Lin Song Li, Yan Jie Zhang, Yan Qing Tian, Shimei Jiang, Yingying Zhao, Yubai Bai, Tie Jin Li

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Three different azobenzene derivatives, namely, 2-(6-methacryloxyhexyloxy)-4-hexyloxy-4′-hexyloxyazobenzene (A1) and poly{6-[5-hexyloxy-2-(4-hexyloxypheny)azophenyloxy]hexyl methacrylate}x-co-{2-hydroxyethyl methacrylate}y, (A2, x = 0.8, y = 0.2), and (A3, x = 0.2. y = 0.8), have been synthesized to study the characterization of Langmuir monolayers at the air-water interface and the aggregation and orientation of Langmuir-Blodgett (LB) films on a solid substrate. The surface pressure-area isotherms showed that they could form well-defined condensed-type monolayers, with A1 and A2 undergoing conformational transition. The monolayers of A1 and A3 could be deposited onto substrate at 20 mN/m at 20 °C with a near unity transfer ratio. The polarized Fourier transform infrared and polarized UV-vis spectra revealed that LB films of A1 and A3 on substrates had in-plane orientation with the long axis of azobenzene moiety exhibiting a large tilt angle (42° and 35°, respectively) with respect to the substrate normal. The UV-vis spectra of A1 and A3 gave us information that A1 and A3 formed J-aggregate both in solution and in LB films.

Original languageEnglish (US)
Pages (from-to)5231-5236
Number of pages6
JournalLangmuir
Volume14
Issue number18
DOIs
StatePublished - Sep 1 1998
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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