Shear thinning in dilute and semidilute solutions of polystyrene and DNA
نویسندگان
چکیده
منابع مشابه
Capillary electrophoresis of RNA in dilute and semidilute polymer solutions.
We report separations of RNA molecules (281-6583 nucleotides) by capillary electrophoresis in dilute and semidilute solutions of aqueous hydroxyethylcellulose (HEC) ether in varying buffers. RNA mobility and peak band widths are examined under both nondenaturing and also denaturing conditions. From studies of sieving polymer concentration and chain length, it is found that good separations can ...
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1. Introduction Our understanding of polymer dynamics has greatly improved due to the reptation model and the scaling ideas. [1] According to scaling and reptation theory, the diffusion coefficient in semidilute or concentrated regimes is related to the molar mass and polymer concentration by D ~ M-2 c-1.75 and D ~ M-2 c-3 for good-solvent and θ-solvent conditions, respectively. In a limited ra...
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Dilute polymer solutions and polymer melts in shear flow have been extensively studied experimentally and theoretically. However, a systematic experimental study to understand the influence of concentration, temperature and molecular weight on the rheology of semidilute polymer solutions is currently lacking. Such knowledge is of crucial importance in a number of industrial and biological conte...
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Steady state viscosity and thixotropy of hydrophobically modified hydroxyethyl cellulose ~HMHEC! and nonassociative cellulose water solutions are studied. Although all the samples are shear thinning, only the HMHEC is thixotropic, since the migration of hydrophobes to micelles is controlled by diffusion. The Cross model fits steady state curves. The Mewis model, a phenomenological model that pr...
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Polymer-induced interactions between two small mesoscopic particles of radius R and between a particle and a wall are investigated for dilute or semidilute embedding solutions of long flexible nonadsorbing polymer chains with radius of gyration Rg . Asymptotically exact predictions are obtained using a ‘‘small radius expansion,’’ to express the interactions in terms of properties of the polymer...
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ژورنال
عنوان ژورنال: Journal of Rheology
سال: 2018
ISSN: 0148-6055,1520-8516
DOI: 10.1122/1.5010203