Abstract
Concentrated solutions of block copolymers of polystyrene and polyisoprene have been quenched from a high temperature to a lower temperature. The changes in scattering intensity following such a quench were studied using time-resolved small-angle neutron scattering. From these data the rate constant for the relaxation process, R( Q), was obtained as a function of scattering vector Q. For high concentrations, a maximum in R( Q) as a function of Q 2 was observed as predicted by a time-dependent Ginzburg-Landau model. Values of the Onsager coefficient L o, extracted from these data were several orders of magnitude smaller than those for homopolymer blends.
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