Excimer fluorescence decays and time-resolved emission spectra are reported for isotactic polystyrene/benzyl alcohol (iPS/BA) gels stored at 283 K for extended periods of time. Characterization of the collapse of the coil structure is reported from macroscopic shrinkage measurements and microscopic observations of phase separation. A red-shifted band identified in the excimer emission spectrum is due to a long-lived (29 ns) excimer structure corresponding to a polymer-rich phase. Instability over an extended period of time of the long-lived component in the fluorescence decay of iPS gel is discussed.
Посилання на статтю:
Time-resolved excimer fluorescence studies as a probe of the coil collapse transition and phase separation in isotactic polystyrene/benzyl alcohol gel / Barbara Wandelt and David J. S. Birch and Robert E. Imhof // Polymer. – 1992. – Vol 33. – P. 3558-3563.