Viscometric and light scattering studies of Poly(Viny1 Pyrrolidone). | [Journal of Chemical Society of Pakistan • 1991]

Author(s):

1. Noor Ahmad: National Centre Excellence Physical Chemistry, University of Peshawar, Peshawar, Pakistan

2. Bashir Ahmed: National Centre Excellence Physical Chemistry, University of Peshawar, Peshawar, Pakistan

3. Ali Khan Bhettani: National Centre Excellence Physical Chemistry, University of Peshawar, Peshawar, Pakistan

Abstract:

Polyvinyl pyrrolidone) (PVP) K-30 sample was subjected to fractionation using ethanol-petroleum ether system as solvent and non solvent, eight fractions were obtained and studied having molecular weight in the range 1. 17x104 to 9. 30x104. The corresponding limiting viscosity numbers of the various fractions were determined and the data relating to the methanolic system conform with the theory. A relation between intrinsic viscosity, and weight average molecular weight is derived. The second virial coefficient A2 for different fractions were calculated showing increase with decrease in molecular weight. Although this increase is not very pronounce. It was also concluded that methanol is as good solvent as water for PVP light scattering study.

Page(s): 153-156

DOI: DOI not available

Published: Journal: Journal of Chemical Society of Pakistan, Volume: 13, Issue: 3, Year: 1991

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