Ifj. Vankelecom et al., INCORPORATION OF HYDROPHOBIC POROUS FILLERS IN PDMS MEMBRANES FOR USEIN PERVAPORATION, JOURNAL OF PHYSICAL CHEMISTRY B, 101(26), 1997, pp. 5182-5185
Three types of hydrophobic porous fillers (carbon blacks, in situ meth
ylated silicas, and silylated silicas) were incorporated in PDMS (poly
dimethylsiloxane) membranes in order to find out under which condition
s these filled membranes were advantageous for pervaporation of aqueou
s solutions, The properties of these fillers were changed systematical
ly in order to maximize fluxes and selectivities in the pervaporation
of aqueous ethanol, tertiary butyl alcohol, or aroma solutions. Ma-ny
fillers were able to realize an increased membrane selectivity, but no
ne of them could combine this with an increased organic flux. In ?his
respect, silicas silylated with TMCS (trimethylchlorosilane) were foun
d to be the best fillers. The filler addition was most beneficial when
applying feed mixtures that induced low swelling in the membrane.