Synthesis and Characterization of Poly(acrylic acid)/PVP Modified Bentonite Superabsorbent Polymer

2013 ◽  
Vol 805-806 ◽  
pp. 1356-1361
Author(s):  
Pei Qi Wu ◽  
Cheng Zhang Zheng ◽  
Yu Jian He ◽  
Da Zhou Lin ◽  
Zi Jie Wu ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Water Retention ◽  
Swelling Kinetics ◽  
Solution Polymerization ◽  
Superabsorbent Polymer ◽  
Modified Bentonite ◽  
Thermogravimetric Analyzer ◽  
Aqueous Solution Polymerization ◽  
Water Swelling

A novel superabsorbent composite has been prepared via aqueous solution polymerization of acrylic acid (AA) in the presence of PVP modified bentonite powder using N,N-methylenebisacrylamide (MBA) as a crosslinker and potassium persulfate (KPS) as an initiator. The amount of PVP modified bentonite in the superabsorbent affected on the ultimate water absorbency was optimized, and the swelling kinetics and water retention ability were systematically investigated. The composite structure was determined by Fourier transform infrared (FTIR) spectroscopy, Thermogravimetric Analyzer (TG) and the scanning electron microscopy (SEM). The results indicate that the superabsorbents with PVP modified bentonite own superior water-swelling capability and water retention ability.

Synthesis and Characterization of Poly(acrylic acid)/modified Bentonite Superabsorbent Polymer

2011 ◽  
Vol 60 (13) ◽  
pp. 1015-1025 ◽  
Author(s):  
Shiv Sankar Bhattacharya ◽  
Kalyan Kumar Sen ◽  
Suma Oommen Sen ◽  
Subham Banerjee ◽  
Santanu Kaity ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Synthesis And Characterization ◽  
Superabsorbent Polymer ◽  
Modified Bentonite ◽  
Poly Acrylic Acid

Semibatch Aqueous-Solution Polymerization of Acrylic Acid: Simultaneous Control of Molar Masses and Reaction Temperature

2011 ◽  
Vol 5 (5-6) ◽  
pp. 223-231 ◽  
Author(s):  
Roque J. Minari ◽  
Gerardo Caceres ◽  
Paola Mandelli ◽  
Mariana M. Yossen ◽  
Manuel Gonzalez-Sierra ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Reaction Temperature ◽  
Solution Polymerization ◽  
Simultaneous Control ◽  
Aqueous Solution Polymerization

scholarly journals Superabsorbent Polymer With Excellent Water/Salt Absorbency And Water Retention, And Fast Swelling Properties For Preventing Soil Water Evaporation

2021 ◽  
Author(s):  
Haizhou Tian ◽  
Sha Cheng ◽  
Jianghong Zhen ◽  
Ziqiang Lei
Keyword(s):  
Water Retention ◽  
Tap Water ◽  
Good Effect ◽  
Water Evaporation ◽  
Swelling Kinetics ◽  
Superabsorbent Polymer ◽  
Application Development ◽  
Swelling Properties ◽  
Swelling Rate ◽  
Water Salt

Abstract Superabsorbent polymers have important applications in many fields, but insufficiency of water/salt absorbency, water retention, and swelling rate limit its application development. Herein, we fabricated HEC-g-P (AA-co-AMPS)/laterite by aqueous solution polymerization, the structure and morphology of the superabsorbent polymer were characterized by FTIR, SEM and TG/DTG. The optimal water absorbency of the superabsorbent polymer were 1294 g/g, 177 g/g, and 119 g/g in distilled water, tap water, and 0.9 wt% NaCl solution, respectively. The superabsorbent polymer had good water retention and re-swelling properties at different temperatures, and fast water absorption rate, and reached swelling equilibrium at 5 min. The swelling mechanism of the superabsorbent polymer was explained by the pseudo-second-order swelling kinetics model and Ritger-Peppas model. The effect of the amount of hydrogel on the water evaporation rate in soil was studied, and it had a good effect.

scholarly journals Swelling Kinetics and Rheological Characterization of Methyl Acrylate-Vinyl Acetate-Acrylic Acid Hydrogels

2014 ◽  
Vol 26 (7) ◽  
pp. 1898-1904 ◽  
Author(s):  
Muhammad Aslam Malana ◽  
Gulistan Firdous ◽  
Abeera Javed ◽  
Zafar Iqbal Zafar ◽  
Muhammad Saleem Khan
Keyword(s):  
Acrylic Acid ◽  
Vinyl Acetate ◽  
Methyl Acrylate ◽  
Swelling Kinetics ◽  
Rheological Characterization

Photopolymerisation and characterization of maleylatedcellulose-g-poly(acrylic acid) superabsorbent polymer

2014 ◽  
Vol 101 ◽  
pp. 231-239 ◽  
Author(s):  
Amatjan Sawut ◽  
Mamatjan Yimit ◽  
Wanfu Sun ◽  
Ismayil Nurulla
Keyword(s):  
Acrylic Acid ◽  
Superabsorbent Polymer ◽  
Poly Acrylic Acid

Preparation and Characterization of Immobilized α-Amylase

2012 ◽  
Vol 602-604 ◽  
pp. 1186-1189
Author(s):  
Zhi Jie Geng ◽  
Song Bai Lin ◽  
Gao Shuang Huang ◽  
Ai Ru Ke
Keyword(s):  
Aqueous Solution ◽  
Enzymatic Activity ◽  
Immobilized Enzyme ◽  
Kinetic Studies ◽  
Maximum Activity ◽  
Solution Polymerization ◽  
Adsorption Method ◽  
Aqueous Solution Polymerization

P(DMAA-co-AM)hydrogel; adsorption method; a-amylase; Immobilized enzyme. Abstract. P(DMAA-co-AM)hydrogel was prepared by aqueous solution polymerization with N,N-dimethylacrylamide(DMAA) and acrylamide(AM) as monomers.,taking the P(DMAA-co-AM) hydrogel as carrier, a-amylase was immobilized by adsorption method.The investigation of effection of temperature and pH on enzymatic activity exhibites that the optimum temperatures are 50°C for both free and immobilized enzyme,the maximum activity is observed at pH 6.0 for both free and immobized enzyme. The activity of immobilized a-amylase remaines higher 40% at sixth run. Kinetic studies demonstrate that: Km values are 5.15749 and 1.44479 mg/mL for free and immobilized enzyme, Vmax values are 2.56082 and 0.58272 mg/mL min-1 for free and immobilized enzyme.

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