Abstract
An attempt was made to verify the effect of free volume dissimilarity, which is predicted by the cell (or free volume) theory, upon the χ parameter. Osmotic pressures of moderately concentrated polyisobutene solutions in n-pentane, n-hexane, and n-heptane were measured at various temperatures, and values of the χ1 parameter were obtained. It was found that χ1 increases with increasing temperature in each system, and decreases with the increasing chain length of n-alkanes used as solvents at fixed temperature. This effect is in agreement with the cell theory. Lower critical solution temperatures (L.C.S.T.) of various polyisobutene–n-alkane systems were calculated from experimental χ1 values by using the theoretical relationship. These predicted L.C.S.T. values are compared with values experimentally obtained by Patterson, et al.
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Okazawa, T., Kaneko, M. Role of Free Volume Change on Polymer Solutions; Osmotic Pressure of Moderately Concentrated Polyisobutene–Normal Alkane Systems. Polym J 2, 747–755 (1971). https://doi.org/10.1295/polymj.2.747
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DOI: https://doi.org/10.1295/polymj.2.747