Abstract
In this work, an in situ pressure-contact Fourier transform infrared attenuated total reflectance (FTIR-ATR) spectroscopy apparatus was designed and developed for measuring liquid transport in free-standing polymer films. This new technique allows time-resolved infrared data of liquid transport in free-standing films to be collected accurately without solution casting the film directly onto the ATR element. Liquid water transport in free-standing films of a rubbery polymer (poly(isobutylene); PIB), a glassy polymer (poly(methyl methacrylate); PMMA), and a cross-linked polymer (epoxy/amine resin) was investigated using this technique. The in situ pressure-contact FTIR-ATR spectroscopy apparatus showed similar results to those obtained using the conventional solution-cast FTIR-ATR apparatus for PIB. Non-Fickian behavior was observed for both the solution-cast and free-standing PMMA due to the nonequilibrium state of the polymer. However, the rate of water sorption did not match between the two; the former w...
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