Abstract: Organo-montmorillonte filled polydimethysiloxane (PDMS) hybrid membrane was prepared by means of the solution method using cetyltrimethylammonium bromide (CTAB) pillared montmorilloniteXRD and SEM were used to characterize the hybrid membrane morphologyThe results showed that the hybrid membranes with intercalated montmorillonite silicate layers exhibited optimized mechanical strengthThe effect of filler content on the pervaporation of ethanol from aqueous solution was investigated and enhanced separation performance with a maximum separation factor over 10 was observedA possible mechanism that the organo-montmorillonte in the membrane acted as permeable reactive passageways for mass transfer was proposed.