The viscosity and osmotic pressure of a fraction of poly-2-vinylpyridine have been measured in various solvents, and the parameters concerning the solubility of this polymer, that is, the osmotic have been obtained: poly-2-vinylpyridine has a solubility parameter of ca. 10.4 (cal./cc.)1/2 and acts as an electron donor. As a result of the specific interaction between a solvent and the pyridine nitrogen of this polymer, the solvent power is greater in an acidic solvent and smaller in a basic than would be expected from the solubility parameter alone. An especially strong interaction between poly-2-vinylpyridine and aliphatic alcohols, chloroform and nitroethane has been observed and its nature has been discussed.
The viscosities of dilute solutions of several fractions of poly-2-vinylpyridine have been measured in methanol, isopropanol, chloroform, benzene, dioxane, and methyl ethyl ketone at difmeters behave regularly in benzene and dioxane. Qualitatively the same results have also been obtained with the poly-4-vinylpyridine fraction in several solvents, including methanol and chloroform. These results show that in alcohols and chloroform the temperature coefficient of the solubility of polyvinylpyridines is negative, and indicate the presence of strong interaction between segments and solvents, probably due to hydrogen-bond formation.
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