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A number of hydrophilic copolymers based on glycidyl methacrylate (GMA) and ethylene glycol dimethacrylate (EGDM) were synthesized using the technique of suspension polymerization. A number of diluents such as dimethylpthalate (DMT), diethylpthalate (DET), dibutylpthalate (DBT) and bis‐2‐ethylhexylpthalate (diocylphthalate, DOT) were used. The resulting polymers were modified into strongly basic anion exchange resins using 50% aqueous trimethylamin hydrochloride solution. In this study, the effects of amount and nature of diluents on resin properties, i. e. porosity, density, mechanical properties and capacities, were investigated. The effect of amount of crosslinking agent, i.e. the amount of EGDM, was also studied. It was found that resin become porous as the number of methylene groups in diluents increases. The pore volume changes from 0.05 to 1.35 ml/g as the diluent change from DMT to DOT. The mechanical strength of the resin decreases on increasing the number of methylene groups in the diluent. However, the chloride capacity shows no significant change. By varying the amount of crosslinking agent (from 10 to 50%) the chloride capacity changes from 3.46 to 1.2 meq/g, respectively. The effect of crosslinking on porosity was also investigated. It was found that porosity of the resin increases on increasing the amount of EGDM. This is the first time that strongly basic anion exchange resin based on GMA‐co‐EGDM using different and varying amounts of diluents, as well as various degrees of crosslinkage, were synthesized and characterized. The important aspect of this study is that it provides a guideline for the synthesis of a resin with specific properties by selection of a diluent and varying its ratio with respect to the monomer.

ABSTRACT:A novel series of copolymeric acrylamide/ potassium acrylate superabsorbents, blended with poly(vinyl alcohol), have been synthesized by using N, NЈ-methylenebisacrylamide as a crosslinker and potassium persulphate (K 2 S 2 O 8 ) as an initiator. Swelling behavior of these hydrogels in water was investigated; and on the basis of swelling properties, the diffusional behavior of water into these hydrogel systems was analyzed. It was observed that with the increase of amount of poly(vinyl alcohol) or crosslinking, the swelling of the hydrogels decreased. The hydrogel synthesized by addition of 5% poly(vinyl alcohol) and 0.25% crosslinking showed maximum swelling of 54445%.

Fundamental studies regarding the synthesis of a porous copolymer synthesized from 1-vinyl-2-pyrrolidone and divinylbenzene in the presence of different diluents were carried out. A series of porous copolymer resins was synthesized by suspension polymerization using the following diluents: dimethylphthalate (DMT), diethylphthalate, dibutylphthalate, and bis-2-ethyl hexylphthalate [dioctylphthalate (DOT)]. It was observed that the porosity of resin increases with increase in length of the methylene group in the phthalate ester of DMT to DOT. In another series of experiments the amount of solvent was increased from 30 to 60% while the crosslinkage was kept constant at 30% and the diluent used was DOT. It was observed that the porosity of resins increased as the fraction of solvent increased. However, surprisingly, the Na ϩ capacity did not show any appreciable change by varying the amount or nature of diluent, remaining approximately 4 meq/g. The resin remained mechanically strong despite higher porosity. The mechanical strength also did not show any significant change by varying the diluent or amount of diluent. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 3917-3920, 2004

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