Molten polystyrene structures above the glass transition, T > Tg

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DOIResolve DOI: http://doi.org/10.1002/polb.22313
AuthorSearch for: ; Search for:
TypeArticle
Journal titleJournal of Polymer Science Part B: Polymer Physics
Volume49
Issue19
Pages13691380; # of pages: 12
SubjectCompressibility; Dynamic moduli; Equation-of-state; Polystyrene; Rheology; Thermal expansion
AbstractThe old controversial idea of structures in molten amorphous polymers is being accepted with theoretical and experimental evidence. Wool’s twinkling fractal theory of the glass transition and recent atomic force micrographs are convincing proof of the dynamic, solid aggregate presence below and above Tg. This article offers detailed analysis of the experimental data from high-pressure dilatometry, as well as from the oscillatory shear tests in the glassy and themolten state of polystyrenes. The results indicate the presence of a transient structure at T > Tg; transient as it depends on the structure of the vitreous polymer and the rate of heating it across Tg. Thus, molten polymer is not always at the thermodynamic equilibrium.
Publication date
LanguageEnglish
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NRC number54369
NPARC number19019534
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Record identifier3f4e3512-fd82-43bd-82ad-27efecb8b7d7
Record created2011-12-02
Record modified2016-05-09
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