Fluorescence excitation spectroscopy of polystyrene near the critical concentration c

The critical concentration c* was measured using both fluorescence excitation spectroscopy and light scattering for four narrow molecular weight distribution samples of polystyrene (MW = 225,000–1,500,000) in bicyclo[4.4.0]decane (decahydronaphthalene, decalin) at 20 and 30°C. A discontinuity in the...

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Bibliographic Details
Published in:Journal of applied polymer science 2007-04, Vol.104 (1), p.360-364
Main Authors: Healy, M. Sean, Hanson, James E.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
fluorescence
light scattering
Organic polymers
phase diagrams
Physicochemistry of polymers
polystyrene
Properties and characterization
Solution and gel properties
solution properties
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Summary:The critical concentration c* was measured using both fluorescence excitation spectroscopy and light scattering for four narrow molecular weight distribution samples of polystyrene (MW = 225,000–1,500,000) in bicyclo[4.4.0]decane (decahydronaphthalene, decalin) at 20 and 30°C. A discontinuity in the corrected intensity of a band in the excitation spectrum (assigned to the dimmer complex) as a function of concentration allowed determination of the critical concentration, c*, from the excitation spectra. The c* resulting from fluorescence and light scattering were identical within experimental error and were comparable to c* values calculated from literature methods. Fluorescence excitation spectroscopy should be a convenient method for determining c* for aromatic polymers. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 360–364, 2007
ISSN:0021-8995
1097-4628
DOI:10.1002/app.24796