ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The effect of solubilized benzene on the viscosity of aqueous solutions of a polysoap, derived from poly-2-vinylpyridine and n-dodecyl bromide was found to be different, both in kind and in order of magnitude, from the simple viscosity depression characteristic of solubilized aliphatic hydrocarbons. As the benzene content of a given solution is increased, the viscosity at first rises, reaches a maximum, and decreases again, below its initial value, until the solution is saturated. The maximum rise in the reduced viscosity increases very strongly with increasing concentration of the polysoap, indicating that the viscosity increase is caused by interactions between polysoap molecules. On the other hand, the reduced viscosity depression at benzene saturation is not sensitive to the polysoap concentration and may therefore be ascribed to a contraction of the individual polysoap molecules. Both at the viscosity maximum and at benzene saturation, the respective amounts of benzene solubilized by unit amount of polysoap were found to be independent of the polysoap concentration. These results are interpreted to mean that the polysoap molecules act as independent solubilizing units, but that their structure is changed by the solubilized benzene is such a way as to strongly affect their mutual interaction. Based on the assumption that the benzene is solubilized both in the hydrocarbon and in the ionic regions of the polysoap molecules, a mechanism for the structure changes which would explain the viscosity maxima is suggested.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1952.120090402
