Order-disorder transitions in block copolymer thin films studied by guided wave depolarized light scattering with grating couplers

Jeffrey D. Wilbur, Zhuangxi Fang, Bruce A. Garetz, Maurice C. Newstein, Nitash P. Balsara

Research output: Contribution to journalArticle

Abstract

We demonstrate the use of guided wave depolarized light scattering (GWDLS) with diffraction gratings for studying the properties of soft block copolymer films in the vicinity of order-disorder transitions. The order-disorder transition temperature (TODT) of 500 nm thick poly(α- methylstyrene-block-isoprene) films is determined by this technique. Atomic force microscopy on quenched samples is used to verify our conclusion. Disordering and ordering dynamics of these films were examined in real time as the films were heated and cooled across the TODT. Our work opens the door for using depolarized light scattering for locating transitions between optically isotropic and optically anisotropic block copolymer phases in thin films.

Original languageEnglish (US)
Pages (from-to)4464-4470
Number of pages7
JournalMacromolecules
Volume41
Issue number12
DOIs
StatePublished - Jun 24 2008

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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