Abstract
The solubility parameter (δ2) of polystyrene was measured by the maximum [δ] method in four series of solvents which were structurally different. In each case δ2 varied with the solvent series used, from 8·75 to 9·25 (cal/ml)1/2 The enthalpy parameter (XH), which was calculated for polystyrene dissolved in at least one member of each series, was then used to derive δ2, and little or no variation in δ2, with solvent was observed. The average value was δ2 = 9·16 ± 0·1 (cal/ml)1/2 It has been shown that determination of δ2, from [η]max can be solvent-dependent because of the influence of the entropy term Xs. It was concluded that if reliable values of δ2 are to be obtained, they should be estimated from XH.
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