Deviations from the mean field predictions for the phase behaviour of random copolymers melts

Details Deviations from the mean field predictions for the phase behaviour of random copolymers melts Deviations from the mean field predictions for the phase behaviour of random copolymers melts

2001-12-19

arxiv.org/abs/cond-mat/0112355v1

Europhys. Lett. 58 (2002), p. 660--665

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 4 figures, LateX

Scientific paper

10.1209/epl/i2002-00400-0

We investigate the phase behaviour of random copolymers melts via large scale Monte Carlo simulations. We observe macrophase separation into A and B--rich phases as predicted by mean field theory only for systems with a very large correlation lambda of blocks along the polymer chains, far away from the Lifshitz point. For smaller values of lambda, we find that a locally segregated, disordered microemulsion--like structure gradually forms as the temperature decreases. As we increase the number of blocks in the polymers, the region of macrophase separation further shrinks. The results of our Monte Carlo simulation are in agreement with a Ginzburg criterium, which suggests that mean field theory becomes worse as the number of blocks in polymers increases.

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