Pressure, Temperature, and Thickness Dependence of-Induced Devitrification of Polymer Films
- 23 October 2003
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 91 (17) , 175503
- https://doi.org/10.1103/physrevlett.91.175503
Abstract
The glass transition temperature is known to increase with decreasing film thickness h for sufficiently thin poly(methyl methacrylate) films supported by silicon oxide substrates. We show that this system undergoes a CO2 pressure-induced devitrification transition, P(g), which is film thickness dependent, P(g)(h)=DeltaP(g)+P(bulk)(g). P(bulk)(g) is the bulk glass transition and DeltaP(g) can be positive or negative depending on T and P. The phenomenon of retrograde vitrification, wherein the polymer exhibits a rubbery-to-glassy-to-rubbery transition upon changing temperature isobarically, is also shown to occur in this system and it is film thickness dependent.Keywords
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