Abstract
The relaxation of concentration fluctuations in symmetric ternary solutions of two polymers of the same molecular weight at the same concentration in a common good solvent is discussed. The correlations of total concentration and of composition are decoupled, and the two relaxation modes are a pure cooperative mode and a pure interdiffusion mode. The relaxation time of the cooperative mode is the same as for a binary polymer solution at the same concentration. The interdiffusion relaxation rate can be written as the sum of a hydrodynamic contribution and of a contribution due to the friction of the blobs on their environment
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