Swelling properties of CMC-g-poly (AAm-co-AMPS) superabsorbent hydrogel

2009 ◽  
Vol 113 (6) ◽  
pp. 3442-3449 ◽  
Author(s):  
Ali Pourjavadi ◽  
Hossein Ghasemzadeh ◽  
Fatemeh Mojahedi
Keyword(s):  
Swelling Properties ◽  
Superabsorbent Hydrogel

Synthesis and Swelling Properties of Hydrolyzed Cottonseed Protein Composite Superabsorbent Hydrogel

2010 ◽  
Vol 59 (12) ◽  
pp. 1018-1032 ◽  
Author(s):  
Buning Zhang ◽  
Yingde Cui ◽  
Guoqiang Yin ◽  
Xinming Li ◽  
Yawen You
Keyword(s):  
Swelling Properties ◽  
Cottonseed Protein ◽  
Superabsorbent Hydrogel

scholarly journals Development of Novel Superabsorbent Hybrid Hydrogels by E-Beam Crosslinking

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 189
Author(s):  
Ion Călina ◽  
Maria Demeter ◽  
Anca Scărișoreanu ◽  
Marin Micutz
Keyword(s):  
Sol Gel ◽  
Absorbed Dose ◽  
Crosslinking Density ◽  
Mechanical Analysis ◽  
Hybrid Hydrogel ◽  
Beam Radiation ◽  
Swelling Properties ◽  
Superabsorbent Hydrogel ◽  
Swelling Degree ◽  
Hybrid Hydrogels

In this study, several superabsorbent hybrid hydrogel compositions prepared from xanthan gum (XG)/sodium carboxymethylcellulose (CMC)/graphene oxide (GO) were synthesized by e-beam radiation crosslinking. We studied and evaluated the effects of GO content from the chemical structure of the hydrogels according to: sol-gel analysis, swelling degree, diffusion of water, ATR-FTIR spectroscopy, network structure, and dynamic mechanical analysis. The gel fraction and swelling properties of the prepared hydrogels depended on the polymer compositions and the absorbed dose. The hybrid XGCMCGO hydrogels showed superabsorbent capacity and reached equilibrium in less than 6 h. In particular, the XGCMCGO (70:30) hydrogel reached the highest swelling degree of about 6000%, at an irradiation dose of 15 kGy. The magnitude of the elastic (G′) and viscous (G″) moduli were strongly dependent on the absorbed dose. When the degree of crosslinking was higher, the G′ parameter was found to exceed 1000 Pa. In the case of the XGCMCGO (80:20) hydrogel compositions, the Mc and ξ parameters decreased with the absorbed dose, while crosslinking density increased, which demonstrated that we obtained a superabsorbent hydrogel with a permanent structure.

Preparation, Swelling and Water-Retention Properties of Crosslinked Superabsorbent Hydrogels Based on Guar Gum

2010 ◽  
Vol 96 ◽  
pp. 177-182 ◽  
Author(s):  
Wen Bo Wang ◽  
Ai Qin Wang
Keyword(s):  
Acrylic Acid ◽  
Water Retention ◽  
Guar Gum ◽  
Weight Ratio ◽  
Ammonium Persulfate ◽  
Sodium Acrylate ◽  
Swelling Properties ◽  
Superabsorbent Hydrogel ◽  
Water Retention Properties ◽  
Superabsorbent Hydrogels

Utilization of natural polymer as matrix for preparing hydrogels can improve the performance of the materials and render them environmentally friendly. In this work, the guar gum-g-poly(sodium acrylate) (GG-g-PNaA) superabsorbent hydrogels were prepared by the solution graft copolymerization of natural guar gum (GG) with partially neutralized acrylic acid (NaA) using ammonium persulfate (APS) as initiator and N,N′-methylenebisacrylamide (MBA) as crosslinker. FTIR spectra confirmed that NaA had been grafted on GG chains. The effects of reaction variables including the concentration of APS and MBA, the weight ratio of acrylic acid (AA) to GG and the neutralization degree of AA on water absorption were investigated. The superabsorbent hydrogel prepared under optimal condition gives the best absorption of 1107 g∙g–1 in distilled water and 88 g∙g–1 in 0.9 wt% NaCl solution. Effects of external pH on the swelling properties of hydrogels were investigated, and the practical water retention properties of the hydrogels were also evaluated. Results indicated that the hydrogels exhibited excellent pH-stability in a wide pH range from 4 to 11, and the water-retention capabilities of sand soils were also greatly improved after utilizing the superabsorbent hydrogels. This superabsorbent hydrogels could be used as potential eco-friendly water-saving materials for agricultural or ecological application.

Preparation of Cottonseed Protein-Based Superabsorbent Hydrogel Composite

2011 ◽  
Vol 328-330 ◽  
pp. 1589-1593 ◽  
Author(s):  
Bu Ning Zhang ◽  
Ying De Cui ◽  
Guo Qiang Yin ◽  
Hong Bin Zhou
Keyword(s):  
Sodium Sulfite ◽  
Radical Copolymerization ◽  
Hydroxyethyl Methacrylate ◽  
Potassium Persulphate ◽  
Free Radical Copolymerization ◽  
Swelling Properties ◽  
Cottonseed Protein ◽  
Superabsorbent Hydrogel ◽  
Hydrogel Composite ◽  
Swelling Capacity

A novel superabsorbent hydrogel was obtained by graft coplolymerization of cottonseed protein (CP), acrylic acid (AA) and 2-hydroxyethyl methacrylate (HEMA). This composite was synthesized by free radical copolymerization in aqueous solution in the presence of redox initiators, potassium persulphate and sodium sulfite, and N, N-Methylene bisacrylamide (NMBA) as cross-linking agent. The effects of the certain variables of the copolymerization on the swelling capacity of the hydrogel were measured and its swelling properties in different solutions were investigated. This approach shows a promising method in utilizing cottonseed protein to synthesis superabsorbent polymer with excellent water absorbency and potential in various applications.

Preparation of nanocomposite hydrogels with nanoclay: characterization, swelling properties and dye adsorption behavior

2020 ◽  
Vol 65 (2) ◽  
pp. 119-133
Author(s):  
Nesrimne SEDIIKI ◽  
◽  
Djamel ALIOUCHE ◽  
Imene BOUDHENE ◽  
◽  
...  
Keyword(s):  
Dye Adsorption ◽  
Adsorption Behavior ◽  
Swelling Properties ◽  
Nanocomposite Hydrogels

Imine Based Self-Healing Hydrogel Triggered by Periodate

2020 ◽  
Author(s):  
Alexis Wolfel ◽  
Cecilia Inés Alvarez Igarzabal ◽  
Marcelo Ricardo Romero
Keyword(s):  
Functional Groups ◽  
Time Window ◽  
Crosslinking Reaction ◽  
Self Healing ◽  
Swelling Properties ◽  
Covalent Bonds ◽  
Smart Systems ◽  
Primary Amino ◽  
Vicinal Diols ◽  
Aldehyde Groups

<p>Design of materials with novel sensitivities and smart behaviour is important for the development of smart systems with automated responsiveness. We have recently reported the synthesis of hydrogels, cross-linked by <i>N,N'</i>-diallyltartardiamide (DAT). The covalent DAT-crosslinking points have vicinal diols which can be easily cleaved with periodate, generating valuable a-oxo-aldehyde functional groups, useful for further chemical modification. Based on those findings, we envisioned that a self-healable hydrogel could be obtained by incorporation of primary amino functional groups, from <a>2-aminoethyl methacrylate </a>hydrochloride (AEMA), coexisting with DAT into the same network. The a-oxo-aldehyde groups generated after the reaction with periodate would arise in the immediate environment of amine groups to form imine cross-links. For this purpose, DAT-crosslinked hydrogels were synthesized and carefully characterized. The cleavage of DAT-crosslinks with periodate promoted changes in the mechanical and swelling properties of the materials. As expected, a self-healing behavior was observed, based on the spontaneous formation of imine covalent bonds. In addition, we surprisingly found a combination of fast vicinal diols cleavage and a low speed self-crosslinking reaction by imine formation. Consequently, it was found a time-window in which a periodate-treated polymer was obtained in a transient liquid state, which can be exploited to choose the final shape of the material, before automated gelling. The singular properties attained on these hydrogels could be useful for developing sensors, actuators, among other smart systems.</p>

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