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- W3145869611 abstract "Polyaniline-based membranes were developed during this work. The combination of polyanilinewith PVDF offers the opportunity of creating large, dense and stable membrane areas in asimple and reproducible way.New production techniques were tested to meet the requirements of large scale applications andto overcome the poor mechanical properties of polyaniline. In order to fulfil industrial requirements,with PVDF a material was found that combines well with polyaniline and forms stableand thin composite membranes having high flux and selectivity in gas-separation applications.By simultaneous reduction of the film thickness the permeation rate could be increased by atleast 5 times compared to the data in other publications. The thickness of the polyaniline layercould be reduced down to 1.6μm. The separation factors for some interesting gas pairs are:H2/CO2 (3.5), CO2/CH4 (40) and 02/N2 (7).In the case of nitrogen, diffusion coefficients were determined that are by some orders higherthan those observed by other authors.Also the impact of factors such as the exchange state, membrane thickness, temperature andfeed pressure on selectivity and permeability were testedThinnest polyaniline layers on PVDF supports allowed the observation of permeation changeduring doping and dedoping the membranes. It has also been illustrated in how far the gas fluxresponds to doping. In these tests the change of permeability was observed in situ.Smallest microporous defects can be plugged without affecting the polyaniline layer itself, andstill maintaining selectivity. The combination of polyaniline / PVDF with siloxanes allowsplugging microscopic defects without restricting the permeant flux.In sorption tests in the case of oxygen, the Dual-mode model was found to be appropriate todescribe sorption, whereas sorption on nitrogen could satisfactorily be described by the Langmuirisotherm.Isotherms of carbon dioxide indicate that the Dual-mode model applies at pressures up to 35bar.Multi-layer sorption and condensation at still higher pressures can be described by the BET model." @default.
- W3145869611 created "2021-04-13" @default.
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- W3145869611 date "2002-01-01" @default.
- W3145869611 modified "2023-09-26" @default.
- W3145869611 title "Development and characterisation of polyaniline-based composite membranes for gas-separation" @default.
- W3145869611 hasPublicationYear "2002" @default.
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