Dilute‐Solution Dynamic Viscoelastic Properties of Cellulose Tricarbanilates

Carriere, C. J.; Schindlauer, G.; Schrag, John L.; Ferry, John D.; Müller, Michael

doi:10.1122/1.549902

Cited by 9 publications

(5 citation statements)

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“…Compared to G ′ of TCP, a remarkable increase of G ′ in these frequencies was observed. The exponent of the power law, 2/3, agrees with previous experimental studies and the exponent used in the hybrid theory − but smaller than the theoretical value of 3/4 for the tension mode of semiflexible chains with L λ –1 ≫ 1 . We noted that this power law behavior should not be attributed to the Zimm mode, which can be observed after relaxation of the tension mode, because such power law behavior is not observed in K ′ which we describe later.…”

Section: Resultssupporting

confidence: 87%

“…A considerable amount of viscoelastic data for dilute solutions of semiflexible polymers was recorded − and analyzed using the hybrid theory, in which the complex shear modulus of the polymer is represented by the sum of the orientational mode of the rod and Zimm modes for flexible polymers . Here, the Zimm modes were introduced to represent the internal motion of semiflexible polymers phenomenologically.…”

Section: Introductionmentioning

confidence: 99%

“…One of the problems for performing experiments using semiflexible polymers is the limited number of model systems suitable for viscoelastic measurements, which normally requires nonvolatile or less volatile solvents. In previous studies, a large amount of viscoelastic data for dilute solutions was obtained via bulk rheological measurements, − and data for entangled solutions obtained via microrheological measurements , were reported. However, these data covered the limited frequency region, and some data were not consistent with the frequency dependence of the high-frequency modulus where the internal mode becomes dominant.…”

Section: Introductionmentioning

confidence: 99%

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Viscoelastic Properties of Tightly Entangled Semiflexible Polymer Solutions

et al. 2018

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The dynamic viscoelasticity and birefringence of well-characterized semiflexible polymer solutionscellulose tris(phenyl carbamate)/tricresyl phosphate solutionswere investigated over a wide concentration region ranging from a dilute to a tightly entangled regime where the entanglement spacing is smaller than the Kuhn segment size. The stress optical rule did not hold true in the tightly entangled regime, indicating that the molecular origin of stress is not simply attributed to the orientation of segments but to the bending of chains, which does not contribute to birefringence significantly. At high frequencies, the power law behavior with the exponent 3/4 due to the tension stress was observed for the complex shear moduli at all the concentrations.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Viscoelastic Properties of Tightly Entangled Semiflexible Polymer Solutions

et al. 2018

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“…Finally, in two interesting papers Carriere et al underline how a recently designed rheometer, the so-called multiple-lumped resonator, permits measurements of the viscoelastic properties for schizophyllan solutions at sufficiently low concentrations and over a wide frequency range, to provide for extrapolation to infinite dilution [28].…”

Section: Dynamic Viscoelastic Modulimentioning

confidence: 99%

“…28 reports the profiles of the viscosity curves for a 1% polymer solution; the 11 values refer to steady state and are independent of the rheological history experienced by the samples. At lower temperatures, the initial Newtonian behavior is followed by an intermediate shear-thickening regime and a subsequent high-shear viscosity drop.…”

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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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Rheologic properties of semi‐rigid polymers for the example of cellulose nitrate, 2. Influence of molecular weight distribution on the flow curves of semi‐dilute solutions

1988

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The apparent viscosity q of semi-dilute solutions of cellulose nitrate in ethyl acetate was measured as a function of shear rate at 20°C by rotational viscometry. The mass concentration c of the solutions was chosen such that the product between c and the intrinsic viscosity was 8 < c . [r7] < 22, lying in the range of viscosity-average degrees of polymerization covered by the employed samples 550 < DP, < 7 600. The experimental flow curves were interpreted in terms of Graessley's theory for non-Newtonian flow of polydisperse polymers. T i e polydispersities derived for five individual samples according to the theory of Graessley were used for calculating the resulting theoretical curves belonging to four binary mixtures ea:h between two of them. The reasonable good agreement between calculated and experimenial reduced flow curves of blends indicates consistency of the theory when applied to the present system of a semi-rigid polymer. This and other results point to a flow behaviour of semi-rigid cellulose nitrate being similar to that of linear flexible polymers.

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Dilute‐Solution Dynamic Viscoelastic Properties of Cellulose Tricarbanilates

Cited by 9 publications

References 0 publications

Viscoelastic Properties of Tightly Entangled Semiflexible Polymer Solutions

Viscoelastic Properties of Tightly Entangled Semiflexible Polymer Solutions

Rheology of polysaccharide systems

Rheologic properties of semi‐rigid polymers for the example of cellulose nitrate, 2. Influence of molecular weight distribution on the flow curves of semi‐dilute solutions

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