Ethylene Vinyl Acetate - Cloisite Nanocomposite Membranes and their Gas Separation Behavior

A.R. Ramadan, A.M.K. Esawi, A. Abdel-Hafiz, C. Charmette, A. Ayral
The American University in Cairo, EG

Keywords: EVA, Cloisite, nanocomposites, gas permeation

Summary:

The current work aims at understanding the correlation between EVA-montmorillonite clay nanocomposite membrane morphology and gas permeation properties. 5wt% of Cloisite-20A and 30B organoclays were added to EVA having 18wt% vinyl acetate. Nanocomposite membranes were prepared by a novel combination of solution compounding, extrusion and compression molding. Characterization was carried out by XRD and TEM. Permeation of He, N2, CH4, CO2 was examined, and selectivity for different gas mixtures determined. Results indicated that permeability and selectivity varied with the morphology of the nanocomposite, which depended on the type of organoclay present in the matrix. The findings indicate the potential of controlling the morphology of EVA-MMT nanocomposite membranes through the type of organoclay used and membrane preparation conditions, for applications in gas separation. This is of relevance to natural gas, biogas and offgas purification.