SOLVENT EFFECT ON FLUORESCENCE LIFETIMES AT SWOLLEN GLASSY-RUBBER INTERPHASE DOMAINS IN BLENDLIKE PARTICLES


PEKCAN O.

JOURNAL OF APPLIED POLYMER SCIENCE, vol.57, no.1, pp.25-36, 1995 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 57 Issue: 1
  • Publication Date: 1995
  • Doi Number: 10.1002/app.1995.070570103
  • Title of Journal : JOURNAL OF APPLIED POLYMER SCIENCE
  • Page Numbers: pp.25-36

Abstract

Fluorescence of naphthalene (N) labeled to poly(methyl metracrylate) (PMMA) particles sterically stabilized by polyisobutylene (PIE) was studied by transient fluorescence method in iso-octane, hexadecane, and in powder form. When samples of dispersions are annealed above 60 degrees C, their room temperature lifetimes increase, and when powder samples are so annealed, lifetimes decrease. Self-quenching effects among N*/N pairs were eliminated to isolate unimolecular lifetimes. Low-frequency intramolecular vibrations are found responsible for the temperature dependence of nonradiative transition of excited N molecules. Corresponding activation energies are measured and found to be between 2300 and 1100 cal/mol. Solvent effects on these activation energies are discussed. (C) 1995 John Wiley and Sons, Inc.