Journal
CHEMISTRY OF MATERIALS
Volume 28, Issue 19, Pages 6975-6984Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.6b02684
Keywords
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Funding
- National Natural Science Foundation of China [21225419]
- National Basic Research Program [2013CB834503]
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Highly transparent polymeric antifogging and frost-resisting films capable of conveniently healing scratches and cuts are fabricated by the dip-coating technique from a solution of hydrogen-bonded poly(vinyl alcohol) (PVA) and Nafion complexes (denoted as PVA-Nafion), and then the as-prepared PVA-Nafion films are soaked in an aqueous NaOH solution to induce the formation of PVA crystallites. The dip-coated PVA-Nafion films can be deposited on plastic substrates such as poly(ethylene terephthalate) and polycarbonate eyeglasses and are sufficiently flexible to endure repeated bending-unbending treatments. The PVA crystallites act as physical cross-linkers and significantly improve the stability of the PVA-Nafion antifogging films in water. Nafion has a hydrogen-bonding interaction with PVA that further improves the stability of the PVA-Nafion films. The excellent antifogging and frost-resisting capabilities of the PVA-Nafion films even under aggressive fogging and frosting conditions originate from the remarkable water-absorbing capacity of PVA in the films. The reversible hydrogen-bonding interactions between PVA and Nafion and the high mobility of the polymer chains triggered by water endow the PVA-Nafion films with the ability to rapidly and repeatedly heal scratches and cuts several hundreds of micrometers wide to restore their high transparency as well as antifogging and frost-resisting functions.
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