MOLECULAR PROBE STUDIES OF FREE VOLUME IN GLASSY POLYMERS.

John M Torkelson*, John G. Victor

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Specific volume measurements and photoisomerization and fluorescence of probe molecules in glassy polymers, polystyrene and polymethylmethacrylate, are reported. A fractional free volume for physical aging, determined from the specific volume measurements, is found to be molecular weight dependent. The photochromic and photophysical measurements are sensitive to local free volume (microviscosity). The amount of local free volume necessary for photoisomerization of 1,1 prime -azonaphthalene is different in the two glassy polymers tested; this amount of local free volume is nearly independent of molecular weight except for low molecular weights (less than about 2000 MW for polystyrene).

Original languageEnglish (US)
Title of host publicationAmerican Institute of Chemical Engineers, National Meeting
PublisherAIChE
StatePublished - Jan 1 1985

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Free volume
Photoisomerization
Volume measurement
Molecular weight
Polymers
Density (specific gravity)
Polystyrenes
Aging of materials
Fluorescence
Molecules

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Torkelson, J. M., & Victor, J. G. (1985). MOLECULAR PROBE STUDIES OF FREE VOLUME IN GLASSY POLYMERS. In American Institute of Chemical Engineers, National Meeting AIChE.
Torkelson, John M ; Victor, John G. / MOLECULAR PROBE STUDIES OF FREE VOLUME IN GLASSY POLYMERS. American Institute of Chemical Engineers, National Meeting. AIChE, 1985.
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Torkelson, JM & Victor, JG 1985, MOLECULAR PROBE STUDIES OF FREE VOLUME IN GLASSY POLYMERS. in American Institute of Chemical Engineers, National Meeting. AIChE.

MOLECULAR PROBE STUDIES OF FREE VOLUME IN GLASSY POLYMERS. / Torkelson, John M; Victor, John G.

American Institute of Chemical Engineers, National Meeting. AIChE, 1985.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - Specific volume measurements and photoisomerization and fluorescence of probe molecules in glassy polymers, polystyrene and polymethylmethacrylate, are reported. A fractional free volume for physical aging, determined from the specific volume measurements, is found to be molecular weight dependent. The photochromic and photophysical measurements are sensitive to local free volume (microviscosity). The amount of local free volume necessary for photoisomerization of 1,1 prime -azonaphthalene is different in the two glassy polymers tested; this amount of local free volume is nearly independent of molecular weight except for low molecular weights (less than about 2000 MW for polystyrene).

AB - Specific volume measurements and photoisomerization and fluorescence of probe molecules in glassy polymers, polystyrene and polymethylmethacrylate, are reported. A fractional free volume for physical aging, determined from the specific volume measurements, is found to be molecular weight dependent. The photochromic and photophysical measurements are sensitive to local free volume (microviscosity). The amount of local free volume necessary for photoisomerization of 1,1 prime -azonaphthalene is different in the two glassy polymers tested; this amount of local free volume is nearly independent of molecular weight except for low molecular weights (less than about 2000 MW for polystyrene).

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Torkelson JM, Victor JG. MOLECULAR PROBE STUDIES OF FREE VOLUME IN GLASSY POLYMERS. In American Institute of Chemical Engineers, National Meeting. AIChE. 1985