Abstract
Based on the experimental data of Venkatesu [P. Venkatesu, J. Chem. Phys. 123, 024902-1 (2005)], we obtained the effective critical exponents of the mixtures of nitroethane (NE) + 3-methylpentane (MP) with three different polyethylene oxides (PEO, M w = 9 105) concentrations c = 0, 0.759 and 1.509 mg cc−1 by the spline fit. We observed that the critical behaviour of pure NE + MP is different from that of the mixtures NE + MP with PEO concentrations c = 0.759 and 1.509 mg cc−1. The mixtures NE + MP + PEO show the second crossovers from the mean-field behaviour to the Ising-like behaviour as the distance from the critical point increases, which may be attributed to the disturbing field of long-range indirect interactions between monomers of the PEO chain and polymer–solvent. It is consistent with the model of the critical behaviour of ‘real’ or ‘nonideal’ systems, which can explain the anomalous critical phenomena of some systems.
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