CONFORMATIONAL TRANSITION OF STYRENE-PARA-CHLOROSTYRENE TRIBLOCK COPOLYMERS IN SELECTIVE SOLVENTS

Solution properties of block copolymers have received much attention in recent years. Two typical conformations have been taken as plausible models to describe the block copolymer conformation; one is a quasi-random coil conformation, and the other is a segregated conformation. In this paper, in order to confirm the previous conclusions, the intrinsic viscosities of the A//mB//2//nA//m and B//nA//2//mB//n copolymers were measured in diisobutyl ketone (DIBK) over a wide temperature range. DIBK is a selective solvent which has a selectivity opposite to cumene