Abstract
For improving the oxygen and water vapor barrier properties of poly(lactic acid) (PLA), a new series of PLA-based nanocomposite films containing an organoclay (OC) and a hydrogel were prepared via the solvent casting method. The synthesized hydrogel was used in a PLA system combined with and without the reactive organo-modified clay. Montmorillonite and the protonated form of SABO®STAB UV 94 were used to prepare the OC via an ion-exchange reaction. The modification of silicate layers was investigated by FTIR, XRD, and TGA techniques. The char residue of the OC obtained was 28% lower than that of the neat montmorillonite, which indicated the presence of SABO in the silicate layer structure. In the presence of the OC, the hydrogel showed a synergistic effect to enhance the barrier properties of PLA. The water vapor permeability decreased from 0.243 to 0.224 g/m2·24 hr in PLA/hydrogel-OC nanocomposite containing 3 mass% each of the hydrogel and OC (PSH 6) compared to the neat PLA. Also, the oxygen permeability of PSH 6 was 37% lower than that of the neat PLA.
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