297 - Layer-by-layer assembly of polymer and clay: Gas barrier and flame retardant thin films
Prof. Jaime C. Grunlan Department of Mechanical Engineering, Texas A&M University, College Station, TX, United States; Department of Chemical Engineering, Texas A&M University, College Station, TX, United States; Materials Science and Engineering Program, Texas A&M University, College Station, TX, United States
Layer-by-layer (LbL) assembly of montmorrilonite (MMT) clay and branched polyethylenimine (BPEI) result in nano brick wall with impressive oxygen barrier and flame retardant behavior. Twenty-four polymer-clay layers results in a film less than 100 nm thick with an undetectable oxygen transmission rate (< 0.005 cc/m2∙day) at room temperature. This film has an oxygen permeability lower than that reported for SiOx-coated plastic film, making a transparent foil replacement. When similar clay-based thin films are deposited on cotton fabric and polyurethane foam, they create a char forming layer that reduces peak heat release rate and eliminates melt dripping (in the case of foam). This environmentally-friendly flame retardant could be used to protect nearly any type of open-celled foam or fabric. All of the properties of these thin films can be tailored by altering pH, concentration, and ionic strength of deposition mixtures, along with varying the type of polycation.
Wednesday, March 30, 2011 10:30 AM
Clay/Polymer Composites: From Nanoplates to Nanotubes (08:30 AM - 12:30 PM)
Location: Hilton Anaheim