Super Stretchy Polymer Multilayer Thin Film with High Gas Barrier
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© 2014 American Chemical Society. Unlike ionically bonded or clay-loaded gas barrier thin films, which easily crack when moderately stretched, hydrogen-bonded poly(acrylic acid) (PAA)/poly(ethylene oxide) (PEO) multilayer thin films remain crack-free. Even after 100% strain, these nanocoatings provide more than a 5X reduction in oxygen transmission rate. This study shows that the lowest modulus PAA/PEO thin film is obtained at pH 3, but maintains a high barrier. A total of 20 PAA/PEO bilayers (367 nm thick) on 1.58 mm rubber reduced the oxygen transmission rate by 1 order of magnitude. Stretching from 25-100% caused plastic deformation and reduced gas barrier, but the oxygen transmission rate remained at least 5X lower than the uncoated rubber. The ability to prevent cracking and preserve the gas barrier up to 100% strain provides a tremendous opportunity for reducing weight and improving the barrier of elastomeric materials. (Figure Presented).
author list (cited authors)
Xiang, F., Ward, S. M., Givens, T. M., & Grunlan, J. C.