The viscometric behaviour of aqueous dilute solutions of polyvinyl alcohol (PVOH) of varying polymer concentration (O.lg/dL-l.Og/dL) and temperature (10 -SO·C) has been studied. Rapid increase in solution viscosity with increase in PVOH concentration are obviously related to polymer nonsphericity and the tendency of molecules to experience extensive nonhydrodynamic interaction. The intrinsic viscosities were obtained by using Huggins equation. By applying the Mark-Houwink expression the "viscosity average molecular weight" was determined. Curves were obtained when values of reduced viscosity vs. temperature were plotted except for 0.1 and 0.2g/dL solution where straight lines with negative slopes were attained.
I KHAN ,A SAEED ,N AHAMD ,S AKBER ,
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