Corresponding state relations for the Newtonian viscosity of concentrated polymer solutions. Temperature dependence

Simha, Robert; Chan, F. S.

doi:10.1021/j100672a013

Cited by 25 publications

(7 citation statements)

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“…6 to all the samples of guar gum or locust bean gum by using c [q] as a reducing parameter (Doublier and Launay 1976). This approach is very much the same as the "corresponding states principle" described by Simha and Chan (1971) for synthetic polymers in solution. The master curves obtained with locust bean gum and guar gum are presented in Fig.…”

Section: Fig 5 Relationships Between the Power Law In-dex N And Gummentioning

confidence: 86%

Rheology of Galactomannan Solutions: Comparative Study of Guar Gum and Locust Bean Gum

Doublier

Launay

1981

Journal of Texture Studies

189

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The rheological properties of several samples of guar gum and locust bean gum, characterized by light scattering and intrinsic viscosity measurements, were studied. The flow curves of concentrated solutions were obtained with a cone‐plate viscometer and their viscoelastic properties were measured with a concentric hemispheres viscoelastometer. The two flow‐units Ree‐Eyring model and the Cross equation gave a good fit to the experimental flow curves. The zero shear rate viscosity, and the relaxation time, of the Ree‐Eyring model depend mainly on the reduced concentration c[η]. This result, as well as the viscoelastic properties, indicate that entanglements play a dominant role in concentrated solutions. From a practical viewpoint, it is possible to predict the flow curve of a galactomannan solution at any concentration if the intrinsic viscosity of the sample is known. However, there are secondary differences in the flow parameters, mainly in the relaxation time, which are not ascribed to [η]. It is hypothesized that these differences are due to the mean branching degree rather than to the botanical origin. As, in solution, the smoothest galactomannan macromolecules are more probably aggregated than isolated, further work should aim at establishing the relationships between aggregate formation and degree of branching.

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Section: Fig 5 Relationships Between the Power Law In-dex N And Gummentioning

confidence: 86%

Rheology of Galactomannan Solutions: Comparative Study of Guar Gum and Locust Bean Gum

Doublier

Launay

1981

Journal of Texture Studies

189

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“…Simha and co-workers [Simha, 1952;Utracki and Simha, 1963;Simha and Somcynsky, 1965;Simha and Chan, 1971;Utracki and Simha, 1981] Comparison of experiment versus a scaling analysis according to Eq. (1.100) indicates that hard-sphere scaling works reasonably well for theta and subtheta conditions [Simha, 1952;Simha and Chan, 1971;Utracki and Simha, 1981], but breaks down for good solvents. For these systems, a molecular weight-dependent scaling concentration can be defined of the form [Utracki and Simha, 1963;Simha and Somcynsky, 1965]…”

Section: Predictive Models For Solutions Of Flexible Neutral Polymersmentioning

confidence: 99%

Newtonian Viscosity of Dilute, Semidilute, and Concentrated Polymer Solutions

Jamieson

Simha

2010

Polymer Physics

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“…Figure 4 displays the values of “ a ” as a function of temperature, obtained for various percentage of 1,4‐dioxane in m ‐cresol. The value of “ a ” increases linearly with the increase in temperature, indicating the deterioration in quality of the solvent with the temperature 4, 22…”

Section: Resultsmentioning

confidence: 99%

Effect of temperature and thermodynamic quality of solvent over unperturbed chain dimensions of nylon 6

Baloch¹,

Nawaz²,

Bano³

2011

J of Applied Polymer Sci

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A nylon 6 sample having average molecular mass 4.825 Â 10 5 g mol À1 was fractionated into five different fractions with respect to molecular mass, which ranged from 3691 to 999,000 g mol À1 . The light scattering and intrinsic viscosity measurements were made in m-cresol and its mixture with 1,4-dioxane. The second virial coefficient, radius of gyration and Mark Houwink's constant and unperturbed chain dimensions were determined by light scattering and viscosity measurement. It has been observed that all these parameters are composition of solvent and temperature dependent. The solvent having composition of 97% m-cresol and 3% dioxane, was best and it deteriorated with the increase/decrease in percentage of 1,4-dioxane in m-cresol. However, its thermodynamic quality was enhanced with the temperature. Such variation in quality of solvent was reflected in all the estimated parameters and showed maxima at this composition of solvent. The unperturbed dimensions obtained by different methods though, differed in values but showed same trend and NA-MKB method gave close results to the one obtained through [g o ]. A new expression has also been proposed relating k o to solvent quality and temperature and the data obtained by us for nylon-6 and the one obtained from the literature for dextran obeyed this expression up to large extent irrespective of the solvent composition and temperature. The proposed equations have also been applied to dextran/methoxy ethylene and dextran/ethylene glycol systems and worked well.

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Corresponding state relations for the Newtonian viscosity of concentrated polymer solutions. Temperature dependence

Cited by 25 publications

References 1 publication

Rheology of Galactomannan Solutions: Comparative Study of Guar Gum and Locust Bean Gum

Rheology of Galactomannan Solutions: Comparative Study of Guar Gum and Locust Bean Gum

Newtonian Viscosity of Dilute, Semidilute, and Concentrated Polymer Solutions

Effect of temperature and thermodynamic quality of solvent over unperturbed chain dimensions of nylon 6

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