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Crossover behavior in dilute polymer solutions: Square-well chains

Lue, L. and Kiselev, S.B. (1999) Crossover behavior in dilute polymer solutions: Square-well chains. Journal of Chemical Physics, 111 (12). pp. 5580-5592. ISSN 0021-9606

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Abstract

Monte Carlo simulations for model polymer chains composed of hard spheres with square-well attractions were performed to find a precise relation between the parameters of a crossover theory and the parameters of the square-well chain. For sufficiently large bond lengths, there was a direct relation between the effective parameters of the crossover theory and the second- and third-virial coefficients of the square-well atoms. For the systems under study, the theta temperature is close to the Boyle temperature of the disconnected monomers, is mainly dependent on the details of the monomer-monomer interactions, and is only weakly dependent on the bond length of the chain. Above the theta temperature, the crossover theory is in good agreement with the simulation data. Near the theta point, the main effect of tricritical corrections is a shift in the critical amplitudes. Other effects are extremely small. The simulation data are consistent with the tricritical crossover theory. However, more precise data are needed to quantitatively test the tricritical crossover theory. (C) 1999 American Institute of Physics. [S0021-9606(99)50536-9].

Item type: Article
ID code: 38477
Notes: English Article 234VC J CHEM PHYS
Keywords: conformational space renormalization, liquid-liquid equilibria, self-avoiding walks, thermodynamic perturbation-theory, monte- carlo simulation, 2nd virial-coefficient, domb-joyce model, theta-point, excluded-volume, 3 dimensions, Physical and theoretical chemistry, Physics, Physics and Astronomy(all), Physical and Theoretical Chemistry
Subjects: Science > Chemistry > Physical and theoretical chemistry
Science > Physics
Department: Faculty of Engineering > Chemical and Process Engineering
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 13 Mar 2012 16:29
    Last modified: 05 Sep 2014 04:31
    URI: http://strathprints.strath.ac.uk/id/eprint/38477

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