scholarly journals Viscosity sinergism of hydrozypropmethyl and carboxy methyl cellulose

2008 ◽  
Vol 62 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Jaroslav Katona ◽  
Verica Sovilj ◽  
Lidija Petrovic
Keyword(s):  
Shear Rate ◽  
Rheological Properties ◽  
Binary Mixtures ◽  
Methyl Cellulose ◽  
Mass Ratio ◽  
Positive Deviation ◽  
Flow Properties ◽  
Concentration Changes ◽  
Overlap Concentration ◽  
Carboxy Methyl

Rheology modifiers are common constituents of food, cosmetic and pharmaceutic products. Often, by using two or more of them, better control of the product rheological properties can be achieved. In this work, rheological properties of hydroxypropymethyl cellulose (HPMC) and sodium carboxymethyl cellulose (NaCMC) solutions of different concentrations were investigated and compared to the flow properties of 1% HPMC/NaCMC binary mixtures at various HPMC/NaCMC mass ratios. Solutions of HPMC and NaCMC were found to be pseudoplastic, where pseudoplasticity increases with increase in the macromolecules concentration. Changes of the degree of pseudoplasticity, n as well as the coefficient of consistency, K with the concentration are more pronounced in HPMC solutions when compared to the NaCMC ones. This is mostly due to the ability of HPMC molecules to associate with each other at concentrations above critical overlap concentration, c , and greater flexibility of macromolecular chains. Binary mixtures of HPMC/NaCMC were also found to be pseudoplastic. Experimentally obtained viscosities of the mixture were proved to be larger than theoretically expected ones, indicating viscosity synergism as a consequence of HPMC-NaCMC interaction. Maximum in synergy was observed when HPMC/NaCMC mass ratio was 0.4/0.6, no matter of the shear rate applied. On the other hand, it was found that relative positive deviation, RPD decreases when shear rate is increased.

scholarly journals Studying the Rheological Properties of Non-Newtonian Fluids Under the Addition of Different Chemical Additives

2020 ◽  
Vol 23 (1) ◽  
pp. 68-80
Author(s):  
Douaa Hussein Ali ◽  
Muhannad A.R. Mohammed
Keyword(s):  
Sodium Chloride ◽  
Polyvinyl Alcohol ◽  
Rheological Properties ◽  
Apparent Viscosity ◽  
Xanthan Gum ◽  
Methyl Cellulose ◽  
Carboxy Methyl Cellulose ◽  
Chemical Additives ◽  
Low Viscosity ◽  
Carboxy Methyl

This research study the rheological properties ( plastic viscosity, yield point and apparent viscosity) of non-Newtonian fluids under the addition of different chemical additives with different concentrations, such as (xanthan gum (xc-polymer) , carboxy methyl cellulose ( high and low viscosity ) ,polyacrylamide, polyvinyl alcohol, starch, quebracho, chrome lignosulfonate, and sodium chloride (NaCl). Fann viscometer model 800 with 8-speeds was used to measure the rheological properties of these samples, that have already been prepared. All samples were subjected to Bingham plastic model. It was concluded that the plastic viscosity, yield point and apparent viscosity should be increased with increasing the concentrations of (xanthan gum (xc-polymer) , carboxy methyl cellulose ( high and low viscosity ) ,polyacrylamide, polyvinyl alcohol, starch and sodium chloride (NaCl), while the opposite is true for quebracho, chrome lignosulfonate.

The Rheological Properties of Turkish Delight

2009 ◽  
Vol 6 (1) ◽  
Author(s):  
Zurriye Yilmaz ◽  
Mehmet Dogan ◽  
Mahir Alkan ◽  
Serap Dogan
Keyword(s):  
Shear Rate ◽  
Rheological Properties ◽  
Power Law ◽  
Food Industry ◽  
Arrhenius Equation ◽  
Flow Behavior ◽  
Effect Of Temperature ◽  
Flow Properties ◽  
Different Temperatures ◽  
Dependent Flow

In the food industry, rheological properties, such as viscosity, shear rate, and shear stress, are the most important parameters required in the design of a technological process. Therefore, in this study, we determined the flow behavior and the time-dependent flow properties of Turkish Delight (TD) in the temperature range of 25-75°C using a capillar rheometer. The structure and thermal properties of TD were investigated by XRD and a simultaneous DTA/TG analysis. The shear rate values ranged from 5 to 300s-1. We found that: (i) TD behaved as non- Newtonian pseudoplastic foodstuff; (ii) while the measurement temperature increased, viscosity decreased; and (iii) TD was a rheopectic material. The effect of temperature on viscosity was described by means of the Arrhenius equation. The activation energies for the flow of pseudoplastic TD varied from 50.1-74.2 kJ/mol, depending on shear rate. Three models were used to predict the flow behavior of TD, namely, the Power law, Bingham and Casson models. The Power law model adequately described well the flow behavior of TD at different temperatures.

Chemical Structure and Rheological Properties of Tara Polysaccharide Gum

2013 ◽  
Vol 821-822 ◽  
pp. 986-989
Author(s):  
Jin Ba ◽  
Li Qiang Jin ◽  
Wen Run Yao
Keyword(s):  
Shear Rate ◽  
Rheological Properties ◽  
Chemical Structure ◽  
Mass Ratio ◽  
Gas Chromatograph ◽  
Plant Polysaccharides ◽  
Mechanical Process ◽  
Composition And Structure ◽  
Ft Ir ◽  
Tree Seeds

Tara gum is a natural hydrocolloid obtained by a mechanical process from the endosperm of Tara tree seeds. In this study, chemical composition and structure of tara polysaccharide gum were characterized by fourier transform infrared spectroscopy (FT-IR) and gas chromatograph-mass spectrometer (GC-MS). Its rheological properties were also discussed. The results showed that tara gum had typical characteristics of plant polysaccharides, which was mainly consisted of galactose and mannose (mass ratio of galactose/mannose was 4.2:1), as well as a small amount of arabinose, glucose and xylose. The viscosity of tara gum solution was increased with the increase of its concentration. The tara gum solution demonstrated a higher viscocity at the shear rate lower than 80 Hz, but a higher elasticity at the shear rate higher than 80 Hz.

Rheological properties of two high polymers suspended in an abrasive slurry jet

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 186-193
Author(s):  
Xinyong Wang ◽  
Dapeng Zhou ◽  
Guodong Zhu ◽  
Chuwen Guo
Keyword(s):  
Rheological Properties ◽  
Newtonian Fluid ◽  
Apparent Viscosity ◽  
Methyl Cellulose ◽  
Effect Of Temperature ◽  
Abrasive Particles ◽  
Nonlinear Fitting ◽  
Abrasive Slurry Jet ◽  
Series Of Experiments ◽  
Carboxy Methyl

Abstract With high polymer added into suspension, the use of abrasive slurry jet (ASJ) has significant advantages in energy management. The quality and efficiency of ASJ are affected distinctly by its structure and the flow field feature, both of which depend on the rheological properties of the abrasive slurry. Therefore, this paper carries out a series of experiments to study the rheological properties of abrasive slurry with polyacrylamide (PAM) and carboxy methyl cellulose (CMC) commonly used in ASJ. The paper also explores the effect of temperature and abrasive on the apparent viscosity of the abrasive slurry. Experimental results show that PAM and CMC solutions behave as a pseudoplastic non-Newtonian fluid in the selected concentration range, whose apparent viscosity increases with the concentration. In addition, specific non-Newtonian fluid constitutive equations of the power-law model for PAM and CMC solution were obtained by nonlinear fitting calculation. The apparent viscosity decreases with the growth of temperature because it leads to the increase in spacing between molecules, making the attraction between molecules smaller and smaller. However, the abrasive has no influence on the apparent viscosity of abrasive slurry for these molecular bonds, and their mechanical entanglements are not destroyed by abrasive particles in the suspension.

scholarly journals A comparative study on the rheological properties of coal water slurries using sodium tripoly-phosphate and carboxy-methyl-cellulose as dispersants

2021 ◽  
Vol 69 (3) ◽  
pp. 100
Author(s):  
M. Ananda Rao ◽  
M. V. Pavan Kumar ◽  
Lenka Srinu
Keyword(s):  
Rheological Properties ◽  
Apparent Viscosity ◽  
Methyl Cellulose ◽  
Flow Behaviour ◽  
Solid Loading ◽  
Carboxy Methyl Cellulose ◽  
Flow Behaviour Index ◽  
Coal Particles ◽  
Behaviour Index ◽  
Carboxy Methyl

The effects of two anionic dispersants (polymeric-carboxy methyl cellulose: CMC and inorganic-sodium tripolyphosphate: STPP) on the rheological properties of coal water slurries (CWS) of varying solid loading were reported and compared. The rheological data was obtained in the shear rate range of 60-160 s<sup>-1</sup> and the data was fitted using power law model. For lower solid concentrations (10% and 20%), shear thickening behaviour was observed while shear thinning nature was seen for the higher solid loadings (30%,40% and 50%) for CWS with both the dispersants. For all slurries, an increase in flow behaviour index values was seen with the increase of dispersant loading. For CWS of 10% and 20% solid loadings, lower values of flow behaviour index was observed with CMC as dispersant. On the other hand, lower values for flow behaviour index was seen with STPP as dispersant for CWS of 30%, 40% and 50% solids loading. Although CMC was found very effective in reducing the apparent viscosity at lower dosages unlike STPP, the apparent viscosity values are quite sensitive to the loading of CMC as dispersant in comparison to STPP. This observed trend may be due to aggressively induced negative charges upon the adsorption of CMC on coal particles at the tested dispersant dosages.

scholarly journals d THE EFFECT OF CONCENTRATIONS OF BENTONITE ON THE PROPERTIES OF NON-NEWTONIAN FLUIDS

2020 ◽  
Vol 20 (1) ◽  
pp. 37-46
Author(s):  
Muhanned A.R.Mohammed
Keyword(s):  
Shear Stress ◽  
Shear Rate ◽  
Yield Point ◽  
Research Study ◽  
Methyl Cellulose ◽  
Plastic Viscosity ◽  
Newtonian Fluids ◽  
Carboxy Methyl Cellulose ◽  
Constant Concentration ◽  
Carboxy Methyl

This research study the properties of Non-Newtonian fluids. Eight samples of Non-Newtonian fluids were prepared, with constant concentration of Carboxy methyl cellulose (CMC) which was (2 gm/500cc), and different concentrations of weighting material (Bentonite). The concentrations of Bentonite were (8, 10, 12, 20, 26, 32, 36, 42) grams with 500 ml water. It was concluded that the increase in the concentration of Bentonite will increase the shear stress with the increase of shear rate. It was also concluded that the increase in the concentration of Bentonite will increase the plastic viscosity, yield point, and density of these Non-Newtonian fluids.

scholarly journals Experimental investigation on influence of microcapsules with PCM on propylene glycol rheological properties

2018 ◽  
Vol 70 ◽  
pp. 02005
Author(s):  
Krzysztof Dutkowski ◽  
Jacek Jan Fiuk
Keyword(s):  
Shear Rate ◽  
Rheological Properties ◽  
Propylene Glycol ◽  
Apparent Viscosity ◽  
Mean Absolute Error ◽  
Absolute Error ◽  
Mass Ratio ◽  
Test Range ◽  
State Measurement ◽  
Steady State Measurement

This paper details an experimental study that was performed to investigate rheological properties of microencapsulated phase change slurry - mPCM (Micronal® DS 5039 X and ERGOLID EKO®- an aqueous solution of propylene glycol). Seven samples of mPCM slurry were prepared with different mass ratio of the Micronal® to the ERGOLID EKO®: 30:70, 40:60, 50:50, 60:40, 70:30, 80:20 and 90:10. The apparent viscosity-shear rate curves were obtained for spindle speed from 0.01 to 100 rpm (shear rate 0.0132 to 132.00 s-1 respectively). The steady state measurement of viscosity was carried out when the slurry reached constant temperatures, namely: 10.0; 15.0, 17.5, 20.0, 22.5, 25.0, 27.5, 30.0, 40.0 and 50.0°C. The apparent viscosity of slurries increases with the mPCM concentration in dispersion rises. Only the sample of 30% Micronal® may be considered as a Newtonian fluid within the test range. Increasing the shear rate ultimately causes apparent viscosity to decrease down to the Newtonian plateau, where it seems to be constant. The variation of the viscosity as a function of temperature and microcapsules concentration was accurately represented by a modified Vogel-Tamman-Fulcher equation at a mean absolute error (MAE) of 10.76%.

scholarly journals Rheological properties of liquid ebonite compositions filled with shungite

2021 ◽  
pp. 65-70
Author(s):  
Y.M. Pushkarev ◽  
◽  
S.V. Saitarly ◽  
Keyword(s):  
Shear Stress ◽  
Shear Rate ◽  
Viscous Flow ◽  
Rheological Properties ◽  
Flow Properties

The effect of shungite on the structural and viscous-flow properties of compositions based on oligobutadiene was studied. The strength of coagulation structures of ebonite compositions filled with shungite was determined. The critical filling concentration was established and it is 40 wt.% of shungite per 100 wt.% of oligobutadiene. It was shown that increasing the temperature from 200C to 800C leads to a significant reduction in the shear stress required to destroy the structure of the composition. Temperature and shear rate independently affect the structured composition. Thus, it was shown that shungite powder can be used as a filler in liquid ebonite compositions based on oligobutadiene.

Study on Removal of Uranium (VI) from Acid Leaching Uranium-Containing Wastewater by Modified CMC Polymer

2011 ◽  
Vol 99-100 ◽  
pp. 919-923
Author(s):  
Shu Kui Zhou ◽  
Guang Ming Zeng ◽  
Ying Jiu Liu
Keyword(s):  
Acrylic Acid ◽  
Uptake Rate ◽  
Contact Time ◽  
Acid Leaching ◽  
Methyl Cellulose ◽  
Carboxy Methyl Cellulose ◽  
Optimal Conditions ◽  
Mass Ratio ◽  
Experimental Conditions ◽  
Carboxy Methyl

U(VI) of the acid leaching uranium-containing wastewater was adsorbed by modified CMC polymer. The result showed that the grafting rate was found to be 68% on the conditions, i.e. temperature 70~80°C, monomers quality concentration 30~35%, Carboxy methyl cellulose and acrylic acid mass ratio of 10:2.5, contact time 3.5~4h. The uranium adsorption capacity of modified CMC was studied and compared with unmodified CMC. The results also revealed that U(VI) ions uptake rate was rather slow, with 75% of the total amount occurring in the first 60min for Modified CMC Polymer. the optimum experimental conditions were CMC quality concentration 0.10g/L, temperature 25°C, pH 5.0, contact time 100min; under the optimal conditions, the removal of U(VI) was 97.1% and 21% higher than unmodified CMC.

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