Rheological properties of aqueous solution of new exopolysaccharide secreted by a deep-sea mesophilic bacterium

Li, Haiping; Hou, Wanguo; Zhang, Yuzhong

doi:10.1016/j.carbpol.2010.12.072

Cited by 24 publications

(19 citation statements)

References 50 publications

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“…As a natural and renewable raw material with abundant sources and no pollution, polysaccharides have good temperature and shear resistance [ 30 ]. Many studies have been published on chitosan, a white powdery solid that is nontoxic, harmless, and biodegradable and has a molecular structure containing highly reactive –OH and –NH 2.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Solution Properties of a Novel Hyperbranched Polymer Based on Chitosan for Enhanced Oil Recovery

Chen

Tang

et al. 2020

Polymers

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A new type of chitosan-modified hyperbranched polymer (named HPDACS) was synthesized through the free-radical polymerization of surface-modified chitosan with acrylic acid (AA) and acrylamide (AM) to achieve an enhanced oil recovery. The optimal polymerization conditions of HPDACS were explored and its structure was characterized by Fourier-transform infrared spectroscopy, hydrogen nuclear magnetic resonance, and environmental scanning electron microscopy. The solution properties of HPDACS in ultrapure water and simulated brine were deeply studied and then compared with those of partially hydrolyzed polyacrylamide (HPAM) and a dendritic polymer named HPDA. The experimental results showed that HPDACS has a good thickening ability, temperature resistance, and salt resistance. Its viscosity retention rate exceeded 79.49% after 90 days of aging, thus meeting the performance requirements of polymer flooding. After mechanical shearing, the viscosity retention rates of HPDACS in ultrapure water and simulated brine were higher than those of HPAM and HPDA, indicating its excellent shear resistance and good viscoelasticity. Following a 95% water cut after preliminary water flooding, 0.3 pore volume (PV) and 1500 mg/L HPDACS solution flooding and extended water flooding could further increase the oil recovery by 19.20%, which was higher than that by HPAM at 10.65% and HPDA at 13.72%. This finding indicates that HPDACS has great potential for oil displacement.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Solution Properties of a Novel Hyperbranched Polymer Based on Chitosan for Enhanced Oil Recovery

Chen

Tang

et al. 2020

Polymers

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“…Evaluation of hysteresis area revealed that all of the formulations except formulation F 10 and F 13 had positive thixotropy behavior. It is generally accepted that the greater the hysteresis area, the stronger the thixotropic property and a good suspension should have high thixotropy and pseudoplastic behavior (11). …”

Section: Resultsmentioning

confidence: 99%

Influence of Flocculating Agents and Structural Vehicles on the Physical Stability and Rheological Behavior of Nitrofurantoin Suspension

Moghimipour

Salimi

Rezaee³

et al. 2014

Jundishapur J Nat Pharm Prod

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Background:Nitrofurantoin is a nitrofuran antibiotic that has been used for treatment of urinary tract against positive and negative bacteria. Objectives: The aim of this study was to evaluate the effect of structural vehicles and flocculating agents on physical stability and rheological behavior of nitrofurantoin suspension. Materials and Methods: To formulate the suspensions, the effect of glycerin and polysorbate 80 as wetting agents was evaluated and their particle sizes were determined using the sieve method. Then to achieve controlled flocculation, sodium citrate and aluminum chloride were added. After choosing the suitable wetting and flocculating agents, structural vehicles such as sodium carboxyl methyl cellulose and Veegum were evaluated individually and in combination. In addition, the effect of sorbitol on density of continuous phase and some physical stability parameters such as sedimentation volume, degree of flocculation and ease of redispersion of the suspensions were evaluated. After incorporation of structural vehicles, the rheological properties of formulations were also determined to find their flow behavior. Results: According to the results, glycerin (0.2%) and sodium citrate (0.3%) had the best effect on the suspension stability as wetting and flocculating agents, respectively. Rheological properties of formulations showed pseudoplastic behavior with some degree of thixotropy. Conclusions: In conclusion, the suspension containing Veegum 1%, sodium carboxy methyl cellulose 1%, glycerine 0.2%, sodium citrate 0.3% and sorbitol 20 % was chosen as the most physically stable formulation.

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“…Evaluation of hysteresis area revealed that all of the formulations except formulations F 8 and F 11 had thixotropy behavior. It is generally accepted that greater hysteresis area leads to stronger thixotropic property, and a good suspension should have a relatively high pseudoplastic behavior and some degree of thixotropy [18]. …”

Section: Resultsmentioning

confidence: 99%

The Effect of Polymer Content on the Non-Newtonian Behavior of Acetaminophen Suspension

Moghimipour

Kouchak

Salimi

et al. 2013

Journal of Drug Delivery

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Acetaminophen is used as an analgesic and antipyretic agent. The aim of the study was evaluation of the effect of different polymers on rheological behavior of acetaminophen suspension. In order to achieve controlled flocculation, sodium chloride was added. Then structural vehicles such as carboxymethyl cellulose (CMC), polyvinyl pyrrolidone (PVP), tragacanth, and magnesium aluminum silicate (Veegum) were evaluated individually and in combination. Physical stability parameters such as sedimentation volume (F), redispersibility (n), and growth of crystals of the suspensions were determined. Also, the rheological properties of formulations were studied. The results of this study showed that the combination of suspending agents had the most physical stability and pseudoplastic behavior with some degree of thixotropy. Viscosity of suspensions was increased by adding NaCl 0.02%. Presence of PVP is necessary for improving rheological behavior of suspensions by NaCl. This may be related to the cross-linking between the carbonyl group in the PVP segment and Na+ ions.

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Rheological properties of aqueous solution of new exopolysaccharide secreted by a deep-sea mesophilic bacterium

Cited by 24 publications

References 50 publications

Synthesis and Solution Properties of a Novel Hyperbranched Polymer Based on Chitosan for Enhanced Oil Recovery

Synthesis and Solution Properties of a Novel Hyperbranched Polymer Based on Chitosan for Enhanced Oil Recovery

Influence of Flocculating Agents and Structural Vehicles on the Physical Stability and Rheological Behavior of Nitrofurantoin Suspension

The Effect of Polymer Content on the Non-Newtonian Behavior of Acetaminophen Suspension

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