56.(スチレン-p-クロロスチレン)・ブロック共重合体の溶液中におけるConformation : 双極子モーメントの測定

概要

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(Styrene-p-chlorostyrene) triblock copolymers of ABA- and BAB-types (A; polystyrene, B; poly-p-chlorostyrene) were prepared by the anionic polymerization technique and their conformational behaviours in solutions were studied from measurements of dipole moments. Two different solvents, toluene and cumene, were used for the study. Toluene is a good solvent for both polystyrene and poly-p-chlorostyrene whereas cumene is a selective solvent, good for polystyrene but poor for poly-p-chlorostyrene. It was found that dipole moment of the block copolymers measured in toluene gives the same value for both the ABA and BAB copolymers, whereas in cumene, the value of dipole moment of the BAB copolymers is smaller than that of the ABA copolymers. The results give an additional support to our previous conclusion that the conformation of the block copolymers in a good solvent such as toluene could be approximated with a pseudo-random coil form, but in a selective solvent, some anomalies take place in conformation of the block copolymers, which was obtained from intrinsic viscosity and light scattering measurements.
東京女子大学の論文
1982-03-20