Abstract
The dimensionless ratio σ G , expressing quantitatively the effects of heterointeractions between unlike units on the conformational properties of copolymers, has been determined experimentally by intrinsic viscosity analysis for the A 2 B and A 3 B miktoarm stars in various solvent conditions. In the case of symmetric samples (where the lengths of A and B arms are the same) in a common good solvent, the values of the required Flory parameter Φ for homopolymer stars with three and four arms were used. For the other cases and solvent conditions, Φ was determined by extended Monte Carlo calculations which provide a lower bound of this quantity. The experimental values of σ G are compared with the results obtained by Monte Carlo simulations and recent renormalization group predictions.
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