Poly(lactic acid) (PLA) has been increasingly employed
as a promising
packaging material. Unfortunately, PLA film suffers low oxygen barrier
and poor antifogging issues, which extremely restrict its practical
applications. Despite some progress, to date it remains a challenge
to construct a biodegradable, transparent, highly oxygen-barriered
and antifogging coating for the PLA film via a facile approach. Here,
we report a facile construction of biodegradable and all-organic coating
with high transparency via hydrogen-bonded layer-by-layer assembly
of poly(vinyl alcohol) (PVA) and tannic acid (TA). With the presence
of 20 bilayers of PVA and TA, the oxygen permeability is reduced to
0.52 × 10–16 cm3·cm/[cm2·s·Pa], approximately 450 times lower than that
of PLA film. Moreover, fogging issue for PLA film can be effectively
addressed only with five bilayers of PVA and TA. These improvements
are attributed to the hydrogen-bonding interactions and polyphenol
groups within the multilayer coating. This work may provide a facile
strategy for the design of biodegradable and highly transparent coating
for the high oxygen barrier and antifogging applications by using
organic molecules as building blocks.
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