CRITICAL-DYNAMICS OF AN ASYMMETRIC BINARY POLYMER MIXTURE

The critical dynamics near the consolute point of a relatively low molecular weight asymmetric critical binary polymer mixture is studied with dynamic light scattering. In contrast to a single exponential decay showing a critical slowing down, as has been reported for another low molecular weight polymer blend, we observe both a "fast" and a "slow" relaxation rate. The critical slowing down of the concentration fluctuations is seen to be contained in these two modes.