A new approach to increasing the equilibrium swelling ratio of the composite superabsorbents based on carboxymethyl cellulose sodium salt

Cellulose ◽  
2021 ◽  
Author(s):  
Andrey Sorokin ◽  
Pavel Sukhanov ◽  
Vasiliy Popov ◽  
Sergey Kannykin ◽  
Maria Lavlinskaya
Keyword(s):  
Sodium Salt ◽  
Carboxymethyl Cellulose ◽  
Swelling Ratio ◽  
New Approach ◽  
Carboxymethyl Cellulose Sodium ◽  
Equilibrium Swelling ◽  
Equilibrium Swelling Ratio

scholarly journals Superabsorbent hydrogels enhanced by quaternized tunicate cellulose nanocrystals with adjustable strength and swelling ratio

Cellulose ◽  
2021 ◽  
Author(s):  
Peng Wei ◽  
Weiwei Chen ◽  
Qinghua Song ◽  
Yibing Wu ◽  
Youjia Xu
Keyword(s):  
Water Absorption ◽  
Cellulose Nanocrystals ◽  
Carboxymethyl Cellulose ◽  
Absorption Capacity ◽  
Swelling Ratio ◽  
Biodegradable Material ◽  
Equilibrium Swelling ◽  
The Matrix ◽  
Equilibrium Swelling Ratio ◽  
Superabsorbent Hydrogels

AbstractSuperabsorbent hydrogels were prepared from biodegradable material, where the matrix was cross-linked cellulose and carboxymethyl cellulose and reinforced by quaternized tunicate cellulose nanocrystals (Q-TCNCs). Due to the large amount of hydrophilic groups on cellulose, carboxymethyl cellulose, and Q-TCNCs, the hydrogels had excellent water absorption capacity. The equilibrium swelling ratio of superabsorbent hydrogels exceeded 500 g/g in deionized water and exceeded 120 g/g even in synthetic urine, which was higher than those of commercial absorbent materials composed of copolymers of acrylic acid and acrylamide. The water absorption performances and mechanical properties of the hydrogels could be adjusted by changing the content of Q-TCNCs. The resultant materials were expected to replace those polyolefin-based materials, thereby reducing environmental pollution.

Preparation of pH Sensitive Polyacrylic Acid(PAAc) Macroporous Hydrogels in Aqueous NaCl Solutions and their Characterization

2009 ◽  
Vol 79-82 ◽  
pp. 1999-2002
Author(s):  
Yu Hua Xue ◽  
Wen Yuan Zhao ◽  
Shou Feng Sun ◽  
Hu Yu
Keyword(s):  
Polyacrylic Acid ◽  
Response Rates ◽  
Ph Sensitive ◽  
Swelling Ratio ◽  
Ph Changes ◽  
Nacl Concentration ◽  
Equilibrium Swelling ◽  
Swelling Studies ◽  
Equilibrium Swelling Ratio

In this study, macroporous, pH sensitive polyacrylic acid hydrogels were prepared by using different concentration of aqueous NaCl solutions as the polymerization medium. The optical photos showed that the pore morphologies of the hydrogels were dependent on the concentration of NaCl. Swelling studies showed an increase in equilibrium swelling ratio as the NaCl concentration in the polymerization medium increased from 0 to 0.7mol/L. The hydrogels exhibited stronger sensitivity to pH changes, and showed much faster reswelling and deswelling response rates with the NaCl concentration increasing in the polymerization medium.

Studies on Surface Hydroxypropylation and Swellability of Bacterial Cellulose

2012 ◽  
Vol 601 ◽  
pp. 12-15 ◽  
Author(s):  
Tong Wan ◽  
Li Ying Liu ◽  
Wei Zeng ◽  
Yong Zhu
Keyword(s):  
Surface Modification ◽  
Sodium Hydroxide ◽  
Bacterial Cellulose ◽  
Propylene Oxide ◽  
Acetobacter Xylinum ◽  
Swelling Ratio ◽  
Freeze Dried ◽  
Equilibrium Swelling ◽  
Equilibrium Swelling Ratio

Bacterial Cellulose (BC) consisting of hydrophobic ultra-fine fibers was produced by Acetobacter xylinum. Hydroxypropyl bacterial celluloses (HPBC) were synthesized by surface modification of nano-fibrils via hydroxypropylation using two modifier systems, sodium hydroxide/ propylene oxide as system (I) and sodium hydroxide/urea/propylene oxide as system (II) respectively. The equilibrium swelling ratio (ESR) of HPBC was studied. ESR of HPBC obtained from system (I) was significantly higher than that obtained from system (II). The maximum ESR of HPBC was nearly 70 times larger than that of air dried BC and 10 times larger than that of freeze dried BC.

scholarly journals Preformed particle gel: evaluation and optimization of salinity and pH on equilibrium swelling ratio

2012 ◽  
Vol 2 (2) ◽  
pp. 85-91 ◽  
Author(s):  
Asefe Mousavi Moghadam ◽  
Mohsen Vafaie Sefti ◽  
Mahsa Baghban Salehi ◽  
Ahmad Dadvand Koohi
Keyword(s):  
Swelling Ratio ◽  
Preformed Particle Gel ◽  
Equilibrium Swelling ◽  
Equilibrium Swelling Ratio

scholarly journals Synthesis and characterization of temperature-sensitive and biodegradable hydrogel based on N-isopropylacrylamide

2010 ◽  
Vol 8 (2) ◽  
pp. 426-433 ◽  
Author(s):  
Yueqin Yu ◽  
Yanshun Li ◽  
Chunjing Zhu ◽  
Lingxiu Liu
Keyword(s):  
Enzymatic Degradation ◽  
Molar Ratio ◽  
Solution Temperature ◽  
Swelling Kinetics ◽  
Swelling Ratio ◽  
Nacl Solution ◽  
Equilibrium Swelling ◽  
Cross Linker ◽  
The Cross ◽  
Equilibrium Swelling Ratio

AbstractBased on a biodegradable cross-linker, N-maleyl chitosan (N-MACH), a series of Poly(N-isopropylacrylamide) (PNIPAAm) and Poly(N-isopropylacrylamide-co-acrylamide) [P(NIPAAm-co-Am)] hydrogels were prepared, and their lower critical solution temperature (LCST), swelling kinetics, equilibrium swelling ratio in NaCl solution, and enzymatic degradation behavior in simulated gastric fluids (SGF) were discussed. The LCST did not change with different cross-linker contents. By altering the NIPAAm/Am molar ratio of P(NIPAAm-co-Am) hydrogels, the LCST could be increased to 39°C. The LCST of the hydrogel was significantly influenced by the monomer ratio of the NIPAAm/Am but not by the cross-linker content. In the swelling kinetics, all the dry hydrogels exhibited fast swelling behavior, and the swelling ratios were influenced by the cross-linker content and NIPAAm/Am molar ratios. Equilibrium swelling ratio of all the hydrogels decreased with increasing NaCl solution concentration. In enzymatic degradation tests, the weight loss of hydrogels was dependent on the cross-linker contents and the enzyme concentration.

Effect of pH and temperature on swelling Behaviour of tamarind gum

2021 ◽  
pp. 5471-5474
Author(s):  
Braja B. Panda ◽  
Rudra N. Sahoo ◽  
Nilamadhab Nayak ◽  
Subrata Mallick
Keyword(s):  
Water Content ◽  
Gravimetric Method ◽  
Swelling Ratio ◽  
Effect Of Ph ◽  
Plant Polysaccharide ◽  
Solvent Uptake ◽  
Equilibrium Swelling ◽  
Ph Conditions ◽  
Solvent Molecules ◽  
Equilibrium Swelling Ratio

Natural gum tamarind is a plant polysaccharide extracted from seeds endosperm of the plant, Tamarindus indica Linn. Thin film of the gum was prepared by direct compression method. The prepared film was investigated for the effect of pH and temperature on solvent uptake property of film by gravimetric method. Different swelling parameters such as mass swelling ratio (MSR), equilibrium swelling ratio (ESR), equilibrium swelling ratio (ESw) and the equilibrium water content (EWC) were studied. It was found that swelling parameters were influenced by different pH and temperature conditions. The results suggested that the water content in equilibrium state was similar to body fluid. The gum converted to a high viscous gel of pseudo plastic characteristics in different pH conditions and the mechanism of continuous diffusion of solvent molecules into tablet during swelling was a non fickian and followed a second order kinetics.

Water-Swelling Rubber Containing Small Amount of Nanofillers with Enhanced Water Swelling Durability

2013 ◽  
Vol 774-776 ◽  
pp. 544-547
Author(s):  
Wei Han ◽  
You Hong Tang
Keyword(s):  
Room Temperature ◽  
Superabsorbent Polymer ◽  
Swelling Ratio ◽  
Loss Ratio ◽  
Degree Of Swelling ◽  
Equilibrium Swelling ◽  
Mechanical Behaviours ◽  
Equilibrium Swelling Ratio ◽  
Water Swelling ◽  
Weight Loss Ratio

A series of water-swelling rubbers (WSR) were prepared by directly mixing room temperature vulcanization-2 components silicone rubber (RTV-2 SR) with superabsorbent polymer (SAP) and nanofiller (s) (halloysite nanotube or/and CaCO3). The effects of component on its mechanical behaviours and water-absorbent properties such as degree of swelling, swelling ratio, and weight loss ratio were investigated. The equilibrium swelling ratio increased with increasing amounts of water-absorbent resin. Well-dispersed nanofiller (s) increased the mechanical properties of WSR and prevented SAP breaking off from the elastomer network to effectively enhance the water-swelling durability of WSR.

Effect of Salinity and Temperature on Swelling Behavior of Nano/Micro Polymer Particle

2013 ◽  
Vol 448-453 ◽  
pp. 3993-3997
Author(s):  
Yu Lou ◽  
Wei Yao Zhu ◽  
Xue Ling Zhang ◽  
Yun Qian Long
Keyword(s):  
Oil Recovery ◽  
Polymer Particle ◽  
Swelling Behavior ◽  
Swelling Kinetics ◽  
Swelling Ratio ◽  
Polymer Particles ◽  
Equilibrium Swelling ◽  
Swelling Characteristics ◽  
Equilibrium Swelling Ratio ◽  
Kinetics Of

Nano/micro polymer particles of acrylamide (AM), acrylic acid (AA), methyl methacrylate (MMA) are used to enhance oil recovery. Swelling kinetics of nano/micro polymer particles were investigated through experimental analysis and statistical analysis. The effect of salinity and temperature on swelling behavior over time is studied experimentally. The swelling kinetics of nano/micro polymer particle was described by second order kinetics. Equilibrium swelling ratio and swelling rate were obtained through nonlinear regression. The quantitative relationships between equilibrium swelling ratio and salinity, temperature were presented. Results show that the swelling ratio increases with increasing temperature or decreasing salt concentration. The study provides a direct perspective of swelling characteristics of nano/micro polymer particles for oil recovery enhancement.

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