Layer-by-layer assembly of thin film oxygen barrier

Thin films of sodium montmorillonite clay and cationic polyacrylamide were grown on a polyethylene terephthalate film using layer-by-layer assembly. After 30 clay-polymer layers are deposited, with a thickness of 571 2 nm, the resulting transparent film has an oxygen transmission rate (OTR) below the detection limit of commercial instrumentation (<0.005 cc/m(2)/day/atm). This low OTR, which is unprecedented for a clay-filled polymer composite, is believed to be due to a brick wall nanostructure comprised of completely exfoliated clay in polymeric mortar. With an optical transparency greater than 90% and potential for microwaveability, this thin composite is a good candidate for foil replacement in food packaging and may also be useful for flexible electronics packaging. (C) 2007 Elsevier B.V. All rights reserved.