Synthesis and swelling behaviors of sodium carboxymethyl cellulose-g-poly(AA-co-AM-co-AMPS)/MMT superabsorbent hydrogel
TL;DR: In this paper, a graft copolymerization of acrylic acid (AA)/acrylamide (AM)/2-acrylamide (AM), carboxylate, carboxamide and sulfate was used to synthesize superabsorbents.
About: This article is published in Carbohydrate Polymers.The article was published on 2011-02-11. It has received 608 citations till now. The article focuses on the topics: Carboxymethyl cellulose & Potassium persulfate.
Citations
More filters
TL;DR: In this article, a review of the synthesis, characterization and application of superabsorbent hydrogels in agriculture, mainly those based on polysaccharides, as soil conditioners and as polymer carriers for nutrient release, is presented.
480 citations
TL;DR: A series of novel graphene oxide (GO)/poly(acrylic acid-co-acrylamide) super-absorbent hydrogel nanocomposites were prepared by in situ radical solution polymerization as discussed by the authors.
276 citations
TL;DR: In this paper, a review of polymer gel systems that can handle high-temperature excessive water treatments is presented and categorized into three major types: in situ cross-linked polymer gels, preformed gels and foamed gels.
Abstract: Polymer gel systems as water management materials have been widely used in recent years for enhanced oil recovery applications. However, most polymer gel systems are limited in their ability to withstand the harsh environments of high temperature and high salinity. Those polymer gel systems that can handle high-temperature excessive water treatments are reviewed in this paper and categorized into three major types: in situ cross-linked polymer gels, preformed gels, and foamed gels. Future directions for the development of polymer gel systems for high-temperature conditions are recommended. For excessive water management with temperatures from 80 to 120 °C, current polymer systems are substantially adequate. Polymer gel systems composed of partially hydrolyzed polyacrylamide (HPAM)/chromium can be combined with nanoparticle technology to elongate their gelation time and reduce the adsorption of chromium ions in the formation. Phenolic resin cross-linker systems have reasonable gelation times and gel streng...
209 citations
TL;DR: Nanocomposite hydrogels have special characteristics such as high swelling rate, selectivity and stimuli-sensitive nature and are therefore good bio-absorbent materials for environmental detoxification and biomedical engineering.
Abstract: Nanocomposite hydrogels are polymeric networks that possess a unique property of hydration. The presence of alcohols, carboxylic acids and amides as hydrophilic moieties in structure of nanocomposite hydrogels enhances their stiffness and water-absorbing capacity. Addition of cross-linker in the synthesis of hydrogels increases their stability under extreme conditions of temperature, pH and pressure. Natural polymer-based nanocomposite hydrogels are biodegradable, highly hydrophilic and possess good mechanical strength. Gelatin, chitin, cellulose, pectin, carrageenan, starch and alginate are natural polymers commonly used to fabricate nanocomposite hydrogels. Nanocomposite hydrogels have special characteristics such as high swelling rate, selectivity and stimuli-sensitive nature. Here we review nanocomposite hydrogels for environmental protection and biomedical engineering. Applications in biomedical engineering include drug delivery agents, wound dressing, tissue engineering and antibacterials. Applications in environmental protection include ion exchangers, adsorption, photocatalysis and soil conditioning. Many nanocomposite hydrogels show excellent adsorption selectivity for heavy metal ions: Cu2+ up to 30.35 mg/g, Pb2+ up to 35.94 mg/g, and Zn2+ and Fe3+ up to 94.34 mg/g. Xanthan gum-based nanocomposite hydrogel has removed 96% dye from industrial effluent as reported. In addition, most of the nanocomposite hydrogels showed better adsorption capacity for pollutants in the pH range from 5 to 7. The nanocomposite hydrogels could also be regenerated and successfully utilized for several times. Nanocomposite hydrogels are therefore good bio-absorbent materials for environmental detoxification.
203 citations
TL;DR: The results suggest that these biocompatible composite scaffolds can be used for tissue engineering applications, especially on NIH3T3 fibroblast cell line.
202 citations
References
More filters
TL;DR: In this paper, a superabsorbent hydrogels were prepared from carboxymethylcellulose sodium (CMC) and cellulose in the NaOH/urea aqueous system by using epichlorohydrin (ECH) as crosslinker.
647 citations
TL;DR: In this paper, a graft copolymerization of acrylamide (AM)/itaconic acid (IA) onto cassava starch via a redox initiator system of ammonium persulfate (APS) and N,N,N 0,N 0 -tetramethylethylenediamine (TEMED), in the presence of N, N 0 -methylenebisacrylamides (N-MBA) crosslinking agent, sodium bicarbonate foaming agent, a triblock copolymers of polyoxyethyl
362 citations
TL;DR: In this paper, a chitosan-g-poly(acrylic acid)/attapulgite superabsorbent composite with water absorbency of 159.6 g g � 1 in distilled water and 42.3 g g ¼ 1 in 0.9 wt% NaCl solution was prepared by graft polymerization, using N,N 0 -methylenebisacrylamide as a crosslinker and ammonium persulfate as an initiator.
330 citations
TL;DR: A pH-sensitive semi-interpenetrating polymer network (semi-IPN) superabsorbent hydrogel composed of NaAlg-g-PNaA network and linear polyvinylpyrrolidone (PVP) was prepared by free-radical solution polymerization in the presence of initiator ammonium persulfate (APS) and crosslinker N,N-methylene-bis-acrylamide (MBA).
317 citations
TL;DR: In this article, the effects of reaction variables, such as PSI concentration and terminal pH on the water absorbent capacity have been studied according to structural parameters, which were confirmed by SEM.
278 citations