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Among six grades of polyvinyl alcohol (PVA), PVA V (degree of hydrolysation 99.45%, molecular weight 140000-150000) and PVA VI (degree of hydrolysation 98-99%, molecular weight 85000-146000) were selected for combination with PVA I (degree of hydrolysation 99%, molecular weight 17300) to prepare composite films with different amounts of PVA I and film thickness. The permeability coefficients of diclofenac sodium through these films were determined and the elastic moduli measured. The permeability coefficients increased with the amount of PVA I in the PVA V-I films. Conversely, the presence of PVA I in the PVA VI-I films decreased the permeability of the composite films to diclofenac sodium. PVA VI-I films showed significantly higher permeability than PVA V-I films. These results indicated that PVA I content in the composite films was a critical factor, affecting the apparent solubility and/or swelling properties, and thereby permeability of the composite films. For PVA V-I films, the effect of PVA I on increasing solubility played a dominant role, but for PVA VI-I films, the effect of PVA I on decreasing swelling properties was a more important factor. Film thickness also influenced the permeability coefficients of diclofenac sodium through the composite films; film permeability decreasing with increasing film thickness. The addition of PVA I raised the elastic moduli of PVA VI-I film but showed minimal effect on PVA V-I films. Proper selection of PVA grades and weight ratio was the key element to successful preparation of PVA composite films with the desired characteristics.

Evaluation of Permeability and Mechanical Properties of Composite Polyvinyl Alcohol Films.