Anomalous Translational Diffusion: A New Constraint for Models of Molecular Motion Near the Glass Transition Temperature

Chia Ying Wang, M. D. Ediger

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

A photobleaching technique has been used to measure the translational motion of tetracene in polystyrene near Tg. The intermediate scattering function S(q,t) was observed to become increasingly non-exponential with decreasing temperature. Thus a clear transition from Fickian diffusion to non-Fickian translational motion has been observed. These results support the view that dynamics are spatially heterogeneous in glass-forming materials. A model of translational motion on heterogeneous lattices indicates that the size of the heterogeneous regions is roughly 20 Å. Thus the data presented here place a new constraint on models of molecular motion near Tg.

Original languageEnglish (US)
Pages (from-to)1724-1728
Number of pages5
JournalJournal of Physical Chemistry B
Volume104
Issue number8
DOIs
StatePublished - Mar 2 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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