Comparison of critical micelle concentrations of gradient copolymer and block copolymer in homopolymer: Novel characterization by intrinsic fluorescence

Christopher L.H. Wong, Jungki Kim, Connie B. Roth, John M Torkelson*

*Corresponding author for this work

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

An experimental comparison of the critical micelle concentration (CMC) of gradients and styrene (S)-methyl methacrylate (MMA) block copolymer in blends with homopolymer was analyzed. The fluorescence spectrum for the dilute copolymer solution in tetrahydrofuran (THF) is found to be similar to the dilute solutions of polystyrene (PS) with on peak centered at 330 nm and the second at 280-285 nm. Excimer fluorescence is found to be virtually absent when copolymer is present at trace levels in PMMA. The gradient copolymer exhibits monomer fluorescence nearly exclusively when present at trace levels in PMMA, while when the copolymer exceeds a certain concentration there is a measurable level of excimer fluorescence relative to monomer fluorescence. At gradient copolymer concentrations below 2 wt, the ratio of fluorescence intensity is found to be near zero but exhibits a slight concentration dependence.

Original languageEnglish (US)
Pages (from-to)5631-5633
Number of pages3
JournalMacromolecules
Volume40
Issue number16
DOIs
StatePublished - Aug 7 2007

ASJC Scopus subject areas

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

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