41.稀薄溶液中における(スチレン-p-クロロスチレン)・3-ブロック共重合体のConformation : II. 選択溶媒中における(スチレン-p-クロロスチレン)・ブロック共重合体のConformationの転移

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Intrinsic viscosity, osmotic second virial coefficient, and light scattering of B_mA_nB_m and A_mB_nA_m copolymers (A; styrene monomeric unit, B; p-chlorostyrene monomeric unit, m and n denote the number of units) in cumene, which is a good solvent for polystyrene but a theta solvent for poly-p-chlorostyrene at 59.0℃, were studied over the temperature range of 65℃ to 15℃. The results suggested that conformational transition from a random coil form to a segregated form occurs at a critical temperature which appeared to be in the range of 40℃ to 35℃, depending on the composition, molecular weight and structure of block copolymers; theta condition could not be attained by cooling the block copolymer solutions, and micelle formations due to intermolecular associations were found in some cases below the transition temperature.
東京女子大学の論文
1977-03-25