Journal article
Thermal treatment of dense polyimide membranes
X Duthie, S Kentish, SJ Pas, AJ Hill, C Powell, K Nagai, G Stevens, G Qiao
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | WILEY | Published : 2008
DOI: 10.1002/polb.21521
Abstract
A study has been conducted to clarify the relationship between polymer structure, annealing temperature, and the extent of plasticization by high-pressure CO2 for two typical polyimide membranes; BTDA-DAPI (poly(3,3′-4,4′-benzophenone tetracarboxylic-dianhydride diaminophenylindane) and 6FDA-TMPDA (poly(2,2′bis(3,4′- dicasrboxyphenyl) hexafluoropropane dianhydride-2,3,5,6-tetramethyl-1,4- phenylenediamine). Both membrane materials are exposed to varying levels of thermal annealing at 200 and 250°C. The effect of this heat treatment on free volume is examined using positron annihilation lifetime spectroscopy (PALS), whereas fluorescence spectroscopy is used to monitor changes in electronic st..
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Funding Acknowledgements
Elizabeth Hill assisted with the fluorescence spectroscopy and her input is gratefully acknowledged. Financial support for this project was provided by the Cooperative Research Centre for Greenhouse Gas Technologies and this support is also acknowledged. Some infrastructure is supported by the Particulate Fluids Processing Centre, a Special Research Centre of the Australian Research Council and this support is also appreciated. SJP acknowledges the support of the Australian Research Council for his postdoctoral fellowship. PALS experiments were performed within the framework of the ARC Centres of Excellence program through the ARC Centre for Electromaterials Science.