The Protective Colloid Properties of Partially Saponified Polyvinyl Acetate

I. The Surface Tensions of Aqueous Solution of Polyvinyl Alcohol

Abstract

The changes of the surface tensions to concentration of aqueous solution of polyvinyl alcohol (PVA) were measured by the drop method. The falls of the surface tensions with perfectly saponified polyvinyl acetate (PVAc) were negligible, and with partially acetylated PVA small. With partially saponified PVAc, the falls of the surface tensions became larger as increasing the residual acetyl contents and with the polymer having maldistributed residual acetyl groups the falls of the surface tensions were great. It is concluded that partially saponified PVAc having hydrophobic ester groups and hydrophilic hydroxyl groups maldistributed in a chain indicates the properties of polymer surface active agents.