Abstract
The influence of TiO 2 as inorganic filler in poly(vinylidene fluoride) (PVDF) and polyamideimide (PAI) membranes on various permeation processes has been investigated. PAI/TiO 2 membranes could be prepared without any post-treatment. Furthermore, PAI membranes with 40 wt.% TiO 2 could withstand a temperature treatment at 180 °C with only minor decrease in fluxes. The pore size distribution of the thus treated membranes remained practically unchanged. PVDF/TiO 2 membranes were clearly less susceptible to compaction than pure PVDF membranes during pressure treatment at 30 bar. Additionally, hydrophilic composite membranes with either PVDF or PVDF/TiO 2 supports were tested in vapour permeation experiments for the dehydration of ethanol. The tests covering a temperature range from 78 °C (1 bar) to 135 °C (6.5 bar) revealed that the membranes with the organic–inorganic support showed significantly better permeate quality even at 135 °C accompanied by higher fluxes within the investigated temperature range.
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