Abstract
AbstractThe intrinsic viscosities and the slopes of ηsp/C against C were estimated for natural rubber, polystyrene, and polyisobutene in hydrocarbon and high mol.wt. alkyl ester solvents. Whereas no correlation could be established between slopes and c.e.d. (cohesive energy‐densities) balance of the systems, the plot of [η] versus δ, the solubility parameters of the solvents, yielded smooth curves similar to those obtained by plotting swelling coefficients against δ. GEE's method of estimating δp from swelling coefficients, was therefore extended to estimate δp from viscosity measurements. The present values of δp are in good agreement with those obtained by swelling measurements.
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