Abstract
Novel sorbent hydrogels containing acrylamide/sodium vinylsulfonate, carboxymethyl cellulose and zeolite were synthesized with free radical solution polymerization by using ammonium persulfate/N,N,N’,N’-tetramethylethyle-nediamine as redox initiating pair in presence of poly(ethylene glycol) diacrylate as crosslinker. It was to investigate the water uptake properties of series of the novel hydrogels, the semi IPNs and the hybrid/biohybrid composite hydrogel sorbents synthesized in this study. Water uptake studies were performed in water and in water-solvent (acetone, methanol and tetrahydrofuran) binary mixtures at 25°C, gravimetrically. Some swelling and diffusion parameters were calculated and discussed. It has been seen that the lower equilibrium swelling factor values in all solvent compositions in comparison with the equilibrium swelling factor values in water.
Highlights
Swollen crosslinked hydrophilic copolymers called “hydrogels” are synthesized by free radical crosslinking copolymerization with some multifunctional crosslinkers with some co-monomers including hydrophilic groups for increasing of their swelling capacity
Novel AAm/sodium vinylsulfonate (SVS) hydrogels, AAm/SVS/carboxymethyl cellulose (CMC) semi IPNs, AAm/SVS/ZEO hybrid hydrogels, and AAm/SVS/CMC/ZEO biohybrid hydrogels were prepared by free radical solution polymerization [20]
Swollen AAm based hydrogels made by the polymerization of AAm with an anionic monomer such as SVS, and/or ZEO and/or polysaccharide; such as CMC were investigated as a function of composition to find materials with swelling in binary mixtures of various compositions of water-solvent (ACE, MET and THF)
Summary
Swollen crosslinked hydrophilic copolymers called “hydrogels” are synthesized by free radical crosslinking copolymerization with some multifunctional crosslinkers with some co-monomers including hydrophilic groups for increasing of their swelling capacity. Water uptake property of hydrogels or “hungry networks” accounts for a great number of biomedical and technological applications. Hydrogels are three-dimensional networks of hydrophilic polymer chains with properties in between liquids and solids. A hydrogel can be defined as a polymeric material that exhibits the ability to swell in water and retain a significant fraction of water within its structure without dissolving [4] [5] [6]
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