Dilute Solution Properties of a Polystyrene–Poly(methyl methacrylate) Graft Copolymer Studied by Emission Probe Techniques. 2. Rotational Relaxation Time of the Graft Copolymer by Fluorescence Polarization Measurement

Akira Watanabe, Minoru Matsuda

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Dynamic properties of polystyrene (PS)–poly(methyl methacrylate) (PMMA) graft copolymer in dilute solution were studied by means of fluorescence emission probe techniques; a fluorene unit (Fl) is introduced as an energy donor at an appropriate number in the backbone PS chain by copolymerization with 2-vinylfluorene, and a pyrene unit (Py) is introduced as an acceptor at the end of the PMMA chain grafted from Fl. Energy transfer from Fl to Py within the graft copolymer was strongly suggested from the excitation spectra and fluorescence polarized spectra. The micelle formation of PS–PMMA graft copolymer in binary mixed solvents was demonstrated by the effect of polymer chain conformation on the efficiency of the energy transfer from Fl to Py and is discussed on the basis of the data of the rotational relaxation time ρ around the Py located at the end of the grafted PMMA chain; ρ was obtained by the fluorescence polarized spectra and the lifetime of Py. It was revealed that ρ was increased from 10–9 to 10–7 s, corresponding to the transition phenomena for the formation of the PS–PMMA graft copolymer micelle.

Original languageEnglish
Pages (from-to)2253-2257
Number of pages5
JournalMacromolecules
Volume19
Issue number8
DOIs
Publication statusPublished - 1986 Jan 1

ASJC Scopus subject areas

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

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