ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The osmotic pressures of six well-fractionated samples of polyvinylpyrrolidone were measured in aqueous solution in a Lucite-block type osmometer. The molecular weights and interaction parameters were determined by employing the theory proposed by Maron for osmotic pressure. It was shown that for all of the fractions, a linear relation existed for ψ and y as predicted by the theory. This new method for expressing osmotic pressure data is compared with the more commonly used expression: \documentclass{article}\pagestyle{empty}\begin{document}$ \left( {{\pi \mathord{\left/ {\vphantom {\pi c}} \right. \kern-\nulldelimiterspace} c}} \right) = \left( {{\pi \mathord{\left/ {\vphantom {\pi c}} \right. \kern-\nulldelimiterspace} c}} \right)_0 \left[ {1 + \Gamma _2 c + g\Gamma _{2^2 } c^2 + \ldots } \right] $\end{document} It was found that the molecular weights and T2 are in satisfactory agreement. However, the value ofg was not a constant equal to 0.25, but varied with the molecular weight. The expression for the osmotic pressure given by Maron's theory appears to be an accurate and rapid method of converting osmometric data to molecular weights.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1960.1204414425
