Newtonian viscosity behavior of dilute to moderately concentrated solutions of cellulose acetate butyrate

Patel, Bhavdeep K.; Sinha, Vijay Kumar; Makhija, K. K.; Ray, Arabinda; Trivedi, H. C.

doi:10.1080/00222349008230379

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…The well known ArrheniuseFrenkeleEyring equation (Equation (3)) (Ayal, Gargallo, & Radic, 1993;Patel, Sinha, Makhija, Ray, & Trivedi, 1990) for viscous flow was used for the thermodynamic analysis of the viscous flow to get further details about polymer behavior in solution. Table 2.…”

Section: Thermodynamic Propertiesmentioning

confidence: 99%

Newtonian viscosity behavior of dilute solutions of polymerized whey proteins. Would viscosity measurements reveal more detailed molecular properties?

Eissa

2013

Food Hydrocolloids

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Section: Thermodynamic Propertiesmentioning

confidence: 99%

Newtonian viscosity behavior of dilute solutions of polymerized whey proteins. Would viscosity measurements reveal more detailed molecular properties?

Eissa

2013

Food Hydrocolloids

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“…Eqn. (4.106) is due to Martin [189,190] and can find applications in the field of polysaccharides [11,12,191] At the same time, equations like eqn. (4.106) do not allow any speculation about the transition between dilute and concentrated regimes [192][193][194].…”

Section: From Dilute To Concentrated Solutionsmentioning

confidence: 99%

Rheology of polysaccharide systems

Lapasin

Pricl

1995

Rheology of Industrial Polysaccharides: Theory and Applications

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The transport properties and, specifically, the rheological behavior of real and complex materials such as polysaccharide systems can be significantly affected by several factors, mainly related to molecular and supermolecular features. Most of these factors are common to all polymeric systems, as they have universal character; others are peculiar to carbohydrate polymers. If we bear in mind the concepts discussed in §1.4, we can easily imagine for polysaccharides a variety of structural conditions much wider than that generally observed for synthetic polymers. On both molecular and supermolecular scales, polysaccharides possess special characteristics that reflect specific behavior so that different classes of materials can be identified.Let us consider the molecular scale first: at this level, the polymer backbone and its related features, such as its length in solution, shape, stitfuess and the eventual presence of ionizable groups, playa major role in determining the macroscopic properties of the system, including its rheology. Many of these molecular parameters correlate among themselves (e.g. chain stitfuess and length); others must be combined with external factors such as, for instance, the characteristics of the solvent medium. These latter may, in turn, exert an influence on the conformation adopted by the macromolecule in the medium itself, as well as on the possibility of forming supermolecular structures. In other words, changes in ionic strength, the nature of counterions, temperature or other solvent parameters may induce a conformational transition, thus modifying the hydrodynamic resistance of the macromolecule to flow. Also, if the polymer concentration is high enough, the variations described above may promote structural changes at a supermolecular level and, accordingly, modifications in the rheological behavior. Before leaving this brief comment on solvent characteristics we must mention the viscosity although, R. Lapasin et al. (eds.), Rheology of Industrial Polysaccharides: Theory and Applications

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“…η o is the zero shear viscosity at absolute temperature T and R is the gas constant. This model has been employed to describe the fl ow behaviour in many other cases too [24][25][26] .The plot of η 0 against 1 / T yields a straight line, the slope of which gives ΔG v . Typical plots for the calculation of ΔG v for the terpolymer can be seen in Figure 4.…”

Section: B Effect Of Temperaturementioning

confidence: 99%

Comparative Rheological Properties of Dope Solutions of High Molar-Mass Poly(acrylonitrile-co-itaconic acid) and Poly(acrylonitrile-co-methylacrylate-co-itaconic acid)

Devasia

Nair

Ninan

2004

Polymers and Polymer Composites

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The rheological behaviour of a dope solution of poly(acrylonitrile-co-itaconic acid) copolymer was compared with that of a poly(acrylonitrile-co-methylacrylate-co-itaconic acid) terpolymer of identical molecular weight. The effects of temperature, concentration and shear force on the rheology of the polymer dope were examined. In both cases, the temperature dependence of zero shear viscosity conformed to the Arrhenius-Frenkel-Eyring equation. The free energy change ΔGv increased with concentration more significantly for the copolymer than the terpolymer. The Power Law model was fitted to the shear dependency of the viscosity, and the pseudoplasticity index (n) decreased with the dope concentration. The shear thinning behaviour was more pronounced for the terpolymer than the copolymer. The decreasing trend of the pseudoplasticity index with concentration and temperature was more pronounced in the case of the terpolymer than the copolymer. Empirical models were arrived at, which could predict the n value of the polymers of a given viscosity-average molecular weight at any concentration and temperature. The onset of shear thinning shifted to a lower shear regime with increase in solid concentration.

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Newtonian viscosity behavior of dilute to moderately concentrated solutions of cellulose acetate butyrate

Cited by 4 publications

References 15 publications

Newtonian viscosity behavior of dilute solutions of polymerized whey proteins. Would viscosity measurements reveal more detailed molecular properties?

Newtonian viscosity behavior of dilute solutions of polymerized whey proteins. Would viscosity measurements reveal more detailed molecular properties?

Rheology of polysaccharide systems

Comparative Rheological Properties of Dope Solutions of High Molar-Mass Poly(acrylonitrile-co-itaconic acid) and Poly(acrylonitrile-co-methylacrylate-co-itaconic acid)

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