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Poly(ether imide)/N -methyl pyrrolidinone solutions: kinetics of water vapour absorption and surface layer formation
Poly(ether imide)/N -methyl pyrrolidinone solutions: kinetics of water vapour absorption and surface layer formation
- Source :
- Polymer International. 57:778-784
- Publication Year :
- 2008
- Publisher :
- Wiley, 2008.
-
Abstract
- BACKGROUND: Water sorption by polymer solutions during film fabrication may affect the film morphology and thereby the film properties. RESULTS: Water vapour sorption isotherms at 40 °C of poly(ether imide) (PEI)/N-methyl pyrrolidinone (NMP) solutions were experimentally determined. Considering PEI concentrations ranging from 0 to 20 wt%, results obtained from gravimetric measurements and near-infrared (NIR) spectroscopy, indicative of the total weight uptake and the local water concentration in the bulk solution, respectively, showed that a first stage occurred featuring a quasi-linear time dependence of the weight fraction of absorbed water. Deviations from linearity dependent on the PEI concentration were afterwards observed, this behaviour being more marked for concentrations higher than 14 wt%. To achieve good predictions, the mathematical description of the sorption results must take into consideration both the classical approach using diffusion equations and the possible time dependence of the surface concentration of water at the air-facing interface. CONCLUSION: This paper presents an analysis of water vapour sorption in PEI/NMP solutions combining local and global quantifications of the water content through NIR and gravimetric methods. The development of a mathematical model suggests a possible surface layer formation at the air-facing interface. Copyright © 2008 Society of Chemical Industry
- Subjects :
- chemistry.chemical_classification
Polymers and Plastics
Organic Chemistry
Concentration effect
Sorption
02 engineering and technology
Polymer
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
chemistry
Chemical engineering
Materials Chemistry
Gravimetric analysis
Organic chemistry
Surface layer
0210 nano-technology
Mass fraction
Water content
Water vapor
Subjects
Details
- ISSN :
- 09598103
- Volume :
- 57
- Database :
- OpenAIRE
- Journal :
- Polymer International
- Accession number :
- edsair.doi...........3d2d5e5ff854a10fba27cf55d577ed00
- Full Text :
- https://doi.org/10.1002/pi.2416