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Glass transition in ultrathin polymer films: calorimetric study.

Authors
  • Efremov, Mikhail Yu
  • Olson, Eric A
  • Zhang, Ming
  • Zhang, Zishu
  • Allen, Leslie H
Type
Published Article
Journal
Physical review letters
Publication Date
Aug 22, 2003
Volume
91
Issue
8
Pages
85703–85703
Identifiers
PMID: 14525258
Source
Medline
License
Unknown

Abstract

The ultrasensitive differential scanning calorimetry is used to observe the glass transition in thin (1-400 nm) spin-cast films of polystyrene, poly (2-vinyl pyridine) and poly (methyl methacrylate) on a platinum surface. A pronounced glass transition is observed even at a thickness as small as 1-3 nm. Using the high heating (20-200 K/ms) and cooling (1-2 K/ms in glass transition region) rates which are typical for this technique, we do not observe appreciable dependence of the glass transition temperature over the thickness range from hundreds of nanometers down to 3 nm thick films. The evolution of calorimetric data with film thickness is discussed in terms of broadening of transition dynamics and loss of transition contrast.

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