A super stretchy hydrogen-bonded gas barrier coating was fabricated using layer-by-layer (LbL) assembly. Unlike ionically bonded gas barrier coatings that exhibit mud-cracking after 10% strain, hydrogen-bonded polyethylene oxide (PEO) and polyacrylic acid (PAA) multilayer thin films show no cracking after 100% strain (Fig. 1) due to low modulus. It is proposed that the exceptional elasticity of this coating originates from the intrinsic elasticity of PEO, the moderate bond strength and the breaking-reforming capability of hydrogen bonding. The oxygen transmission rate of a 1 mm thick carcass rubber can be reduced by half with a 500-nm-thick PAA/PEO coating. More importantly, the reduced oxygen transmission rate can be retained even after 100% strain. This finding marks the first super stretchy gas barrier thin film, which is useful for elastomeric substrates designed to hold air pressure. Figure 1. <img src='https://acs-archive-assets2.s3.amazonaws.com/241nm/uploads/62782_membrana_005.jpg' alt='' />

Super stretchy multilayer thin film gas barrier

248th National Meeting (2014)

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