Crosslinking is a common practice to improve the barrier properties of polymers.\nIn this study, Montmorillonite (MMT) was used with Polyvinyl alcohol\n(PVA) to deposit nanocomposite coatings which were crosslinked with glyoxal\n(Gly) by Layer by Layer (LbL) on a PET substrate. Two crosslinking\nconditions were studied, under mild condition and with an acidic environment.\nMild condition was useful to identify the reversibility steps and the optimum\ncrosslinking times while the acidic environment was essential to investigate\nthe crosslinking mechanism, by determining the permeability for\ndifferent crosslinking times. PVA and PVA-MMT coatings showed a strong\ncorrelation between the permeability coefficients for different crosslinking\ntimes and the FTIR results.
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