Accelerated physical ageing of thin glassy polymer films: evidence from gas transport measurements

Pfromm, Peter H.; Koros, William J.

doi:10.1016/0032-3861(95)97336-e

Cited by 180 publications

(177 citation statements)

References 28 publications

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“…Later, Pfromm and colleagues showed similar behavior in free-standing polyimide and polysulfone films (127). Figure 31 shows the oxygen permeability behavior versus aging time for Teflon R films of varying thickness prepared via both solution casting and spin casting methods (128).…”

Section: Sample Dimension Dependent Effects Recently It Has Beenmentioning

confidence: 89%

Polymer Transport Properties

Koros

Burgess

Chen

2015

Encyclopedia of Polymer Science and Technology

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Section: Sample Dimension Dependent Effects Recently It Has Beenmentioning

confidence: 89%

Polymer Transport Properties

Koros

Burgess

Chen

2015

Encyclopedia of Polymer Science and Technology

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“…The model, long ago proposed by Simha and co-workers [26], was more recently revitalized [9,10,12,13,15,19,22,68,73,108,109] after the discovery of accelerated physical aging in polymer membranes as thick as several microns [87]. According to the model, maintaining equilibrium when cooling down a confined glass or recovering it in the physical aging regime is achieved by diffusing out free volume through the free interface.…”

Section: Connection To the Rate Of Spontaneous Fluctuationsmentioning

confidence: 98%

Cooling Rate Dependent Glass Transition in Thin Polymer Films and in Bulk

Cangialosi

Alegría

Colmenero

2016

Fast Scanning Calorimetry

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Polymers confined at the nanoscale are assuming increasing importance in a wide range of applications where miniaturization is required [25,78,85,121,122]. The technological interest on polymers confined at the nanoscale has generated intense research in an attempt of understanding how properties are modified by the presence of the polymer/external world interface. Due to the large area of such interface to volume of polymer ratio, these can dramatically deviate from those of the corresponding bulk system. Among the aspects that have recently received considerable attention, the study of glassy dynamics in nanoscale confinement is certainly

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“…As it is well-known that permeability coefficients decrease with the physical aging of the membrane, [15][16][17]26 the gas permeation properties of these membranes were evaluated after 1,000 h, to check if this unexpected behaviour was transitory ( Figure 8). NMP or acetone films showed similar or even slightly higher permeabilities than the initial ones.…”

Section: Table II Permeability (P Barrers a ) Diffusion Coefficienmentioning

confidence: 99%

“…From this study, big differences have been found on the gas separation properties depending on the casting solvent used. However, as it is well established that permeability coefficients decrease with the physical aging of the membrane, [15][16][17] we have also evaluated the gas separation properties of these membranes after 1,000 h aging at room temperature. The objective of this second study was to examine if the differences observed in gas transport parameters, remained in the aged films.…”

Section: Introductionmentioning

confidence: 99%

Effect of 3,5-diaminobenzoic acid content, casting solvent, and physical aging on gas permeation properties of copolyimides containing pendant acid groups

et al. 2011

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A series of copolyimides containing carboxylic acid groups have been prepared from 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) and two diamines, 2,4,6-trimethyl-1,3-phenylenediamine and bis(4-amino-3-isopropyl-5-methylphenyl)methane. Carboxylic acid groups were introduced using 3,5-diaminobenzoic acid (DABA) as a comonomer in different proportions in both series of polyimides. The polymers were fully characterized using spectroscopic and thermal analysis techniques. The gas permeation properties of the polymer films were investigated and the results were explained mainly by anhydride formation, which depended not only on the -COOH content, flexibility, and structure of the polymer chain but also on the thermal treatment of the membrane. Copolyimides with the lowest DABA content of both series showed the best permeation properties, particularly the copolyimide that contained 25% of acid units, which showed O 2 , N 2 , CH 4 , and CO 2 permeability coefficients close to 40, 10, 7, and 145 barrers, respectively. The gas separation properties were evaluated using three different casting solvents, N-methylpyrrolidinone, tetrahydrofuran, and acetone. At the initial stage, large differences in permeability coefficients were obtained for each copolyimide. On the other hand, after 1,000 h aging at room temperature, the membranes of each series showed similar permeability coefficients.

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Accelerated physical ageing of thin glassy polymer films: evidence from gas transport measurements

Cited by 180 publications

References 28 publications

Polymer Transport Properties

Polymer Transport Properties

Cooling Rate Dependent Glass Transition in Thin Polymer Films and in Bulk

Effect of 3,5-diaminobenzoic acid content, casting solvent, and physical aging on gas permeation properties of copolyimides containing pendant acid groups

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