scholarly journals Rheological behaviours of guar gum derivatives with hydrophobic unsaturated long-chains

RSC Advances ◽  
2020 ◽  
Vol 10 (53) ◽  
pp. 32050-32057
Author(s):  
Minghua Zhang ◽  
Jianping He ◽  
Mingyu Deng ◽  
Peixin Gong ◽  
Xi Zhang ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Guar Gum ◽  
Rheological Behaviors ◽  
Practical Applications ◽  
Hydrophobically Modified ◽  
Long Chains

The rheological behaviors of three hydrophobically modified guar gum derivatives in aqueous solutions were systematically studied for practical applications.

Associating and rheological behaviors of fluorinated cationic guar gum in aqueous solutions

2013 ◽  
Vol 95 (2) ◽  
pp. 637-643 ◽  
Author(s):  
Chen Wang ◽  
Xiaorui Li ◽  
Biao Du ◽  
Peizhi Li ◽  
Haibin Li
Keyword(s):  
Aqueous Solutions ◽  
Guar Gum ◽  
Rheological Behaviors

scholarly journals Synthesis and Solution Properties of Hydrophobically Modified Polysaccharides

2017 ◽  
Vol 7 (2) ◽  
pp. 99 ◽  
Author(s):  
Vitaliy V. Khutoryanskiy
Keyword(s):  
Aqueous Solutions ◽  
Oil Recovery ◽  
Micelle Formation ◽  
Synthetic Methods ◽  
Solution Properties ◽  
Cellulose Ethers ◽  
Pectic Acid ◽  
Practical Applications ◽  
Amphiphilic Macromolecules ◽  
Hydrophobically Modified

Hydrophobically modified polymers are amphiphilic macromolecules mainly constituted of a hydrophilic backbone and hydrophobic side groups. In aqueous solutions these polymers undergo inter- or intra-molecular hydrophobic association, which results in unusual properties useful for a number of practical applications. The areas of application of these polymers include associative thickeners for enhanced oil recovery, pharmaceuticals, personal care formulations, coatings, adhesives, surfactants, emulsifiers, etc. This review presents the analysis of a literature data on preparation of hydrophobically modified polysaccharides (HMP) and their properties in aqueous solutions. Some of the synthetic methods used for hydrophobic modification of non-ionic (cellulose ethers, starch, dextran, pullulan, etc.), anionic (carboxymethylcellulose, hyaluronic<br />acid, pectic acid, alginic acid, heparin) and cationic  olysaccharides (chitosan) are presented. The methodology used for the investigation of solution properties of hydrophobically modified polysaccharides is discussed. Special attention is paid to aggregate and micelle formation in solutions of hydrophobically<br />modified polysaccharides, solubilization of hydrophobic compounds, their rheological properties and surface activity. The effects of polymer architecture (level of hydrophobic substitution, nature of hydrophobic groups, molecular weight of a hydrophilic backbone, etc.), concentration, temperature, presence of inorganic salts and organic solvents on solution properties of hydrophobically modified polysaccharides are discussed. Some applications of hydrophobically modified polysaccharides are briefly highlighted.

Flow Behaviors of High Acyl Gellan Aqueous Solutions as Affected by Temperature, and Calcium and Gellan Concentrations

2008 ◽  
Vol 4 (5) ◽  
Author(s):  
Yiqun Huang ◽  
Pawan Singh Takhar ◽  
Juming Tang ◽  
Barry G Swanson
Keyword(s):  
Shear Rate ◽  
Aqueous Solutions ◽  
Apparent Viscosity ◽  
Flow Resistance ◽  
Effect Of Temperature ◽  
Temperature Changes ◽  
Influence Of Temperature ◽  
Rheological Behaviors ◽  
Low Concentrations ◽  
Influence Of Temperature On

Rheological behaviors of high acyl (HA) gellan are not well understood partially because of its relatively late commercialization compared to low acyl gellan. The objective of this study was to investigate the effect of temperature (5-30 °C), calcium (0, 1 and 10 mM) and gellan concentrations (0.0044-0.1000% w/v) on the flow behaviors of high acyl gellan aqueous solutions using rheological tests. Gellan solutions with 0 or 1 mM added Ca++ exhibited shear thinning behavior at gellan concentrations above 0.0125%. The influence of temperature on apparent viscosity (shear rate, 100 s-1) of gellan solutions can be described with an Arrhenius relationship. The apparent viscosity of gellan solution at low concentrations was more sensitive to temperature changes. The addition of Ca++ led to a decrease in flow resistance for a dilute gellan solution (<0.0125%), but an increased resistance for a relatively concentrated gellan solution (>0.0125%).

scholarly journals Robust Conductive Hydrogels with Ultrafast Self-Recovery and Nearly Zero Response Hysteresis for Epidermal Sensors

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1854
Author(s):  
Xiuru Xu ◽  
Chubin He ◽  
Feng Luo ◽  
Hao Wang ◽  
Zhengchun Peng
Keyword(s):  
Guar Gum ◽  
Strain Range ◽  
Sio2 Nanoparticles ◽  
Fast Response ◽  
Gauge Factor ◽  
Practical Applications ◽  
Hydroxypropyl Guar ◽  
Stable Chemical ◽  
Conductive Hydrogel ◽  
Conductive Hydrogels

Robust conductive hydrogels are in great demand for the practical applications of smart soft robots, epidermal electronics, and human–machine interactions. We successfully prepared nanoparticles enhanced polyacrylamide/hydroxypropyl guar gum/acryloyl-grafted chitosan quaternary ammonium salt/calcium ions/SiO2 nanoparticles (PHC/Ca2+/SiO2 NPs) conductive hydrogels. Owing to the stable chemical and physical hybrid crosslinking networks and reversible non-covalent interactions, the PHC/Ca2+/SiO2 NPs conductive hydrogel showed good conductivity (~3.39 S/m), excellent toughness (6.71 MJ/m3), high stretchability (2256%), fast self-recovery (80% within 10 s, and 100% within 30 s), and good fatigue resistance. The maximum gauge factor as high as 66.99 was obtained, with a wide detectable strain range (from 0.25% to 500% strain), the fast response (25.00 ms) and recovery time (86.12 ms), excellent negligible response hysteresis, and good response stability. The applications of monitoring the human’s body movements were demonstrated, such as wrist bending and pulse tracking.

Adsorption of diazinon from aqueous solutions by magnetic guar gum-montmorillonite

2019 ◽  
Vol 20 ◽  
pp. 100187 ◽  
Author(s):  
Sadaf Nikzad ◽  
Ali Akbar Amooey ◽  
Ali Alinejad-Mir
Keyword(s):  
Aqueous Solutions ◽  
Guar Gum

Characterization of Interactions in Aqueous Solutions of Hydroxyethylcellulose and Its Hydrophobically Modified Analogue in the Presence of a Cyclodextrin Derivative

2006 ◽  
Vol 110 (13) ◽  
pp. 6601-6608 ◽  
Author(s):  
Neda Beheshti ◽  
Huaitian Bu ◽  
Kaizheng Zhu ◽  
Anna-Lena Kjøniksen ◽  
Kenneth D. Knudsen ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Cyclodextrin Derivative ◽  
Hydrophobically Modified
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