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Intrinsic viscosity against temperature plots for two sequence block copolymers of isoprene and styrene in decalin and methyl cyclohexane confirm the general behaviour of these polymers in preferential solvents the operative parameters are le mol.wt., composition and temperature of the less soluble polymer in the particular solvent. The stock mayer fixman relation is abeyed, for a particular composition, at all temperatures, but the unperturbed dimensions in the block appear to drop significantly at temperatures below the transition temperature. Since the constant ph is influenced by the segmental distribution, the drop unperturbed dimensions may be considered to reflect the conformation change from the phase-mixed to phase-separated form. (TITUS).