Fragility of an isochorically confined polymer glass

Chuan Zhang, Yunlong Guo, Kimberly B. Shepard, Rodney D. Priestley

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

We report the effect of isochoric confinement on the dynamic fragility of a polymeric glass-former, that is, polystyrene (PS). Utilizing silica-capped PS nanospheres as a model system, the fictive temperature (Tf) and the isochoric heat capacity (Cv) are measured as a function of diameter via differential scanning calorimetry. By examining Tf as a function of cooling rate for each sample, the isochoric fragility (mv) is obtained, which decreases significantly as the diameter of the nanospheres is reduced from 260 to 129 nm. Hence, the temperature dependence of structural relaxation near the glass transition is weakened with isochoric confinement.

Original languageEnglish (US)
Pages (from-to)431-436
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume4
Issue number3
DOIs
StatePublished - Feb 7 2013

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

Keywords

  • confinement
  • fragility
  • glass transition
  • nanoparticles
  • polystyrene

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