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Dynamic critical exponent in the coil-extended chain transition in a non-ideal solvent

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Summary

The behavior of dilute solutions of polystyrene (M ranging from 0,7.106 to 4.106) in bromoform was studied in the Frank-Keller apparatus. The data obtained confirm the prediction of the non-linear theory of single-chain dynamics on a first order coil-extended chain phase transition in a longitudinal hydrodynamic field. The observed ratios of the measured streaming birefringence to its ultimate value attain 0,95 thus recording a practically complete uncoiling of the macromolecules. The dependence of the fundamental relaxation time on molecular weight is expressed by {ie147-01}

RF, being the Flory radius of the inperturbed chain in an athermic solvent, and {ie147-02} the dynamic critical exponent equal to 2,82±0,15. This value corresponds to data obtained for polystyrene in good solvents by various dynamic methods.

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Authors and Affiliations

  1. Institute of Macromolecular Compounds, Academy of Sciences of the USSR, Bolshoy Prospeckt, 31, SU-199004, Leningrad, USSR

    Yu. V. Brestkin, I. S. Saddlkov, S. A. Agranova, V. G. Baranov & S. Frenkel

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  1. Yu. V. Brestkin
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  2. I. S. Saddlkov
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  3. S. A. Agranova
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  4. V. G. Baranov
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  5. S. Frenkel
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Brestkin, Y.V., Saddlkov, I.S., Agranova, S.A. et al. Dynamic critical exponent in the coil-extended chain transition in a non-ideal solvent. Polymer Bulletin 15, 147–151 (1986). https://doi.org/10.1007/BF00263392

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  • DOI: https://doi.org/10.1007/BF00263392

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