About the Rheology of Polymer Solutions; Part 2: A Model for the Prediction of the Concentration Dependence of the Rheological Parameters of Power-law Fluids

Werner, Franz; Mersmann, Alfons

doi:10.1002/(sici)1521-4125(199808)21:8<644::aid-ceat644>3.0.co;2-1

Cited by 7 publications

(3 citation statements)

References 6 publications

(16 reference statements)

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“…The value of the consistency index ( K ) is taken from the intercept with the τ axis and therefore represents the viscosity at unit shear rate. It is well known that, unlike n , K is sensitive to temperature 68. The calculated results from the rheological behavior study of the two model systems are presented in Table 2 and 3.…”

Section: Resultsmentioning

confidence: 99%

Effect of Nanoplatelets on the Rheological Behavior of Epoxy Monomers

Sun

Boo

Liu

et al. 2009

Macro Materials & Eng

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The effect of nanoplatelets on the rheological behavior of epoxy monomers with variations in nanoplatelet exfoliation level and aspect ratio was investigated. The results show that the presence of exfoliated nanoplatelets in epoxy can significantly influence viscosity and lead to shear‐thinning phenomena, especially when the aspect ratio of the nanoplatelets is high. By employing the Krieger‐Dougherty model, the effectiveness of nanoplatelets in altering epoxy rheological behavior was quantitatively described and compared with experimental findings. Possible physical reasons for the observed rheological behaviors are discussed. The implication of the present study for polymer nanocomposites processing is also addressed.magnified image

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Section: Resultsmentioning

confidence: 99%

Effect of Nanoplatelets on the Rheological Behavior of Epoxy Monomers

Sun

Boo

Liu

et al. 2009

Macro Materials & Eng

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“…In the first approach, numerous researches have been conducted to describe the rheological properties of polymers consisting of variation in viscosity with shear rates [5 -9]. Owing to its simplicity and the small number of material parameters, the Ostwald-de Waele power law model, being made in phenomenological theory, was widely used in early polymer modeling fields, which can be used to mathematically express the power law region of a flow curve as follows [10]:…”

Section: Introduction mentioning

confidence: 99%

A Study of Viscoelastic Model of Polymers in Shear Flow Based on Molecular Dynamic Simulations

Zhou

Fang

Cao³

2021

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In this study, the rheological properties and physical significations of an incompressible viscoelastic (inCVE) the inCVE model was investigated by employing molecular dynamics calculations. Polypropylene (PP) and polystyrene (PS) polymers were selected as candidate materials, the corresponding cell models consisting of five chains of 80 (PP) and 30 (PS) units were built successively. The energy minimization and anneal treatment were launched to optimize the unfavorable structures. The periodic boundary condition, COMPASS force field and the Velocity-Verlet algorithm were employed to calculate the shear flow behavior of chains. The sample data were collected and fitted based on the Matlab platform, and the analysis of the variance (ANOVA) method was performed to determine the validity of the model. Experimental results reveal that the inCVE model matches well with the pseudo-plastic fluids. Compared with the Ostwald-de Waele power law model and Cross model, it is effective and robust, and exhibits a three-stage rheological characteristic. Moreover, it characterizes the stress yield, activation energy, temperature dependence and viscoelastic response of polymers.

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“…Non-Newtonian flow behavior is often observed for microbial biopolymers. 35,40 Molecular Weight of γ-PGA. The molecular weight of the precipitated peptide was about 1.3×10 5 Da for each media used in this study by SDS-PAGE and GPC ( Figure 5).…”

Section: Resultsmentioning

confidence: 99%

Properties of Polyglutamic Acid Produced by Bacillus subtilis ATCC 6633 in Rehydrated Whey Powder Supplemented with Different Carbon Sources

Çağri‐Mehmetoğlu¹,

Venter²

2015

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In this study, the use of rehydrated whey powder (RWP) solutions containing different carbon sources (citric acid, ammonium sulfate, or glutamic acid) for γ-poly(glutamic acid) (γ-PGA) by Bacillus subtilis ATCC 6633 was explored. After 72 h of fermentation at 30 o C, cell growth, γ-PGA production, molecular weight by SDS-PAGE, rheological properties and NMR analysis of γ-PGA were determined. The growth of B. subtilis was significantly different during 72 h of fermentation in RWP, medium E, and RWP containing citric acid or glutamic acid. These results showed the dynamic viscosity of the 1% polymer solution was 2.5 Pa•s at 10 1/sec shear rate. The maximum γ-PGA concentration was 1.57 g/100 mL in RWP containing glutamic acid, citric acid and ammonium sulfate. Therefore, RWP as a waste product with being efficient and more economic fermentation medium to produce γ-PGA can be ideal for the industrial production.

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About the Rheology of Polymer Solutions; Part 2: A Model for the Prediction of the Concentration Dependence of the Rheological Parameters of Power-law Fluids

Abstract: CommunicationsFigure 4. Comparison of measured and calculated (with Eq. (9)) concentrations of different polymers (literature data for autoclaved potato starch [3], PAA Separan AP30 [8], Xanthan gum [9]).

Cited by 7 publications

References 6 publications

Effect of Nanoplatelets on the Rheological Behavior of Epoxy Monomers

Effect of Nanoplatelets on the Rheological Behavior of Epoxy Monomers

A Study of Viscoelastic Model of Polymers in Shear Flow Based on Molecular Dynamic Simulations

Properties of Polyglutamic Acid Produced by Bacillus subtilis ATCC 6633 in Rehydrated Whey Powder Supplemented with Different Carbon Sources

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