Thermodynamic interactions of solvents with styrene–butadiene–styrene triblock copolymers

摘要

AbstractFundamental thermodynamic interaction data for various solvents with two styrene–butadiene–styrene triblock copolymers (Kraton D‐1101 and Kraton D‐1300X) have been collected by the use of inverse gas chromatography at infinite dilution. Experimental results are presented for nine D‐1101/solvent systems and nine D‐1300X/solvent systems at 308, 328. and 348 K. Weight‐fraction activity coefficients and Flory–Huggins χ interaction parameters have been calculated from the retention volumes. The χ parameter is used as a measure of the strength of interaction and therefore as a guide in the prediction of polymer–solvent compatibility. In addition, partial molar heats of mixing, ΔHm∞, and heats of solution, ΔHs, were determined. The Hildebrand–Scatchard solubility theory was combined with the Flory theory in order to estimate the solubility parameter of the thermoplastic rubbers at the thr