Abstract
This paper describes a study of thermodynamic interactions in binary blends of statistical copolymers of 1,4- and 1,2-polybutadiene using differential scanning calorimetric measurements. The Flory−Huggins interaction parameter (χ) obtained for blends with component compositions ranging from 8% to 90% 1,2-polybutadiene were found to be inconsistent with the simple random copolymer theory. The reduced interaction parameter, χ/Δy2, was found to be a strong function of the average composition of the blend, in close analogy to an earlier study on ethylene−butene-1 copolymers prepared by saturation of 1,4-polybutadiene−1,2-polybutadiene copolymers. However, values for χ/Δy2 for the polybutadiene blends were considerably smaller than those present in the ethylene−butene-1 copolymers over comparable ranges of copolymer composition. The PVT properties of the polybutadiene copolymers, on the other hand, suggest a much larger interaction as well as adherence to the random copolymer theory.
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