COLL Ramanathan Nagarajan  Monday, August 29, 2011 

257 - Hydrogen-bonded layer-by-layer films composed of poly(vinyl alcohol) and poly(acrylic acid)

Hyomin Lee1, hyomin@mit.edu, Robert E Cohen1, Michael F Rubner2. (1) Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States, (2) Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States

Poly(vinyl alcohol) (PVA) is a water soluble, biodegradable, and biocompatible polymer with excellent chemical resistance and physical properties. PVA is employed in a wide range of biomedical applications including controlled release systems and tissue engineering. Furthermore, accessibility of the hydroxyl groups makes it a promising candidate for thin film coatings. Here, we demonstrate that layer-by-layer (LbL) assembly of PVA and poly(acrylic acid) (PAA) under carefully controlled deposition conditions yields mechanically stable interdigitated multilayers. In contrast to conventional solution casting techniques, hydrogen bonded LbL assembly allows for nanometer level control of the composition throughout the film. The relatively weak hydrogen bonding of the PVA and PAA system in aqueous environment along with its ability to be cross-linked by heat-induced esterification results in tunable pH-induced degradation behavior. Also with sufficient heat treatment, a reversible, pH-responsive thin film hydrogels could be fabricated. This multilayer system also provides a stable platform for further post-modification.


Monday, August 29, 2011 06:00 PM
Polyelectrolyte Complexes and Multilayers (06:00 PM - 08:00 PM)
Location: Colorado Convention Center
Room: Hall E2

 

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