Drying of glassy polymer varnishes: A quartz resonator study

We have investigated the sorption behavior of polystyrene brushes with thicknesses of 10-200 nm in toluene vapor. The sorption curve displays a kink, which is attributed to the solvent-induced glass transition. The derivative of the sorption curve with respect to solvent activity ("osmotic capacity") shows a glass step at a certain characteristic activity a g. This is the analogue of the glass step observed in the heat capacity at Tg with differential scanning calorimetry. Both ag and the height of the glass step decrease with decreasing film thickness. The glass step is most pronounced after annealing the films at elevated temperatures in a vacuum. Due to accumulation of solvent in the film, the step disappears after repeated swelling/drying cycles.

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“…Details of the experimental setup have been described previously . A schematic description is given in Figure .…”

Section: Experimental and Data Analysismentioning

confidence: 99%

“…Details of the experimental setup have been described previously. 32 A schematic description is given in Figure 1. All samples were annealed in a vacuum oven at 110 °C for 12 h prior to experiment.…”

Section: Experimental and Data Analysismentioning

confidence: 99%

Thickness Dependence of the Solvent-Induced Glass Transition in Polymer Brushes

et al. 1999

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“…Another procedure is based on the analysis of the susceptance spectrum. 16 The time for data acquisition is then decreased to about 0.2 s.…”

Section: Mass Determinationmentioning

confidence: 99%

Mutual Diffusion in PMMA/PnBMA Copolymer Films: Influence of the Solvent-Induced Glass Transition

et al. 2003

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In the framework of solvent diffusion in glassy polymer films, this paper concerns an experimental study of sorption and desorption kinetics for a model system consisting of statistical PMMA/ PnBMA copolymer films of various composition. The experimental results are obtained by performing differential increasing and decreasing pressure steps, using a gravimetric technique based on a quartz crystal microbalance placed in a controlled solvent vapor pressure chamber. The non-Fickian behavior in the glassy state and the variations of the mutual diffusion coefficient with the solvent concentration on one hand and with the copolymer composition on the other hand are studied. Results are analyzed in terms of absolute solvent mass fraction (ω S) and in terms of distance to the glass transition (ωS -ωSg). This last representation highlights the prevailing part of the gap to the glass transition in the system under study.

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“…This property makes polymer electrolytes excellent candidates as humidity sensing materials and indeed a number of polymer humidity sensors are based on this principle [2][3][4]. However, the understanding of the mechanisms of water sorption and ion transport in films of polymer electrolytes is important not only for the construction of humidity sensors, but also for many other scientific and technological fields [5,6]. Nevertheless, this matter is complex as water (or, in general vapour) sorption strongly depends on the type of polymer and on the way of its preparation.…”

Section: Introductionmentioning

confidence: 99%