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In this work, we investigated conditions to deposit cellulose nanocrystal (CNC) films onto polypropylene (PP) by spin coating, and studied the adhesion, mechanical property, and oxygen permeability properties of the CNC-coated PP films. It was found that CNC films maintained proper adhesion on UV ozone-treated PP even when deformed, but cracked when bent beyond a critical radius of curvature or scratched...