Abstract
Most gas barrier thin films suffer from cracking or plastic deformation when stretched, leading to significant loss of barrier. In an effort to make a stretchable gas barrier, which maintains low permeability when exposed to cyclic strain, we prepared layer-by-layer assemblies of tannic acid (TA) and poly(ethylene oxide) (PEO). A 40-bilayer (344 nm-thick) TA/PEO assembly maintained its oxygen transmission rate (6X lower than the 1.6 mm-thick rubber substrate) after being stretched 100%. This submicron coating maintains a barrier 4X lower than the thick rubber substrate even after being strained 20X at 100%. These highly elastomeric assemblies are potentially useful for light-weighting inflatable devices.
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