Competition of Mesoscales and Crossover to Tricriticality in Polymer Solutions

Details Competition of Mesoscales and Crossover to Tricriticality in Polymer Solutions Competition of Mesoscales and Crossover to Tricriticality in Polymer Solutions

2002-01-14

arxiv.org/abs/cond-mat/0201222v1

Phys. Rev. E 65 051805 (2002)

Physics

Condensed Matter

Soft Condensed Matter

4 pages in RevTeX with 4 figures

Scientific paper

10.1103/PhysRevE.65.051805

We show that the approach to asymptotic fluctuation-induced critical behavior in polymer solutions is governed by a competition between a correlation length diverging at the critical point and an additional mesoscopic length-scale, the radius of gyration. Accurate light-scattering experiments on polystyrene solutions in cyclohexane with polymer molecular weights ranging from 200,000 up to 11.4 million clearly demonstrate a crossover between two universal regimes: a regime with Ising asymptotic critical behavior, where the correlation length prevails, and a regime with tricritical theta-point behavior determined by a mesoscopic polymer-chain length.

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