Volume 76, Number 4, November 2006
|Page(s)||630 - 636|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||20 October 2006|
Aging and history effects in solvent-induced glass transition of polymer films
Université Pierre et Marie Curie-Paris 6, Laboratoire FAST and CNRS, Laboratoire FAST, Bât. 502, Campus Universitaire F-91405 Orsay Cedex, France
Accepted: 19 September 2006
Aging and history in glassy polymer films are investigated in the frame of solvent-induced glass transition. By decreasing the pressure of a solvent vapour surrounding a polymer film, the film goes from the rubbery swollen state to the glassy dry state. Gravimetry experiments in a pressure-controlled chamber were performed to analyse aging behaviour for different kinds of solvent vapour pressure cycles. Results are utterly different from those obtained with equivalent temperature cycles: no marked memory effect can be shown; very important hysteresis at small activity as well as complex behaviour of the melting time according to the quench amplitude have been observed. This behaviour may be related to the coupled evolution of two variables, the free volume and the solvent fraction.
PACS: 64.70.Pf – Glass transitions / 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 68.43.Mn – Adsorption/desorption kinetics
© EDP Sciences, 2006
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