This research involves the synthesis of cross-linked sodium polyacrylate hydrogels by solution polymerization technique. Three products were selected from different types of synthesized crosslinked sodium polyacrylate polymers to investigate the physicomechanical properties of sodium polyacrylate hydrogels. Reaction parameters such as time, temperature, concentration of initiators, concentration of activator, concentration of sodium acrylate solution and concentration of cross-linking agents were investigated for crosslinked sodium polyacrylate hydrogels. FT-IR spectroscopic analysis was done for the synthesized hydrogel and the results showed the evidence of positive reactions. Density, viscosity, solubility test, solid content and melting point were measured for all products. Polymer films of the synthesized polymers were made by solution casting method and the mechanical properties were studied. Mechanical properties (ultimate tensile strength, tensile modulus and elongation at break) were measured for all synthesized cross-linked sodium polyacrylate polymers. Swelling properties of cross-linked sodium polyacrylate hydrogels were measured in distilled water, tap water and aqueous sodium chloride solution respectively. Water absorbencies results indicate that this polymer was water-swellable but not watersoluble like super absorbent polymers. …………………………………………………………………………………………………….... Introduction:-Hydrogels are crosslinked network polymeric materials that have received considerable attention in the past 50 years, due to their exceptional promise in wide range of applications. Researchers have defined hydrogels in many different ways. It is a water insoluble polymeric material that exhibits the ability to swell in aqueous conditions and retain a significant fraction of dispersed water within its structure (1) . The dissolution of a hydrophilic polymer in water can be prevented by adding cross-links via either a physical or a chemical process. Physical cross-linking gives reversible hydrogels. Chemical cross-linking gives permanent hydrogels. These cross-linked polymers are soft and rubbery in nature and referred to as "Super Absorbents".Highly swelling polymers, superabsorbent hydrogels are hydrophilic, three dimensional networks that can absorb water in the amount from 10% up to thousands of times their dry weight. They are widely used in hygienics, foods, cosmetics and agriculture. Hydrogels have vast potential applications, including biomedical applications, soil/water stabilization layers in farming, civil engineering
Super absorbent copolymer incorporated with magnesium oxide nanoparticles was investigated for absorptivity in an aqueous solution and anti-bacterial activity against gram-negative Escherichia Coli. Cross-linked copolymers of ionic acrylic acid (A.A.) and nonionic acrylamide (AAm) were synthesized in an aqueous solution via free radical polymerization by providing vigorous mixing and heating. MgO nanoparticles were incorporated into the super-absorbent copolymers during polymerization. For all preparations, the degree of neutralization of acrylic acid was fixed at 75%, the amount of cross-linker NN-MBA was 1% moles of initial monomer, and the initiator potassium persulfate amount was 150 mg. The highest absorption of distilled water was 147 g/g at 80% acrylic acid without MgO nanoparticles content (AA30M). While in 0.9% saline solution, the highest absorption capacity was 39 g/g at 40% acrylamide content (AA10M). Reduced swelling ability was observed by increased magnesium oxide nanoparticles dosage as 121.5 g/g in AA33M copolymer. However, maximum bactericidal activity was observed for AA33M on the agar plate method and Lysogeny broth medium method via UV-spectrophotometer, where the optical density (O.D.) 600 was 0.022. This study is expected to provide a viable solution due to its eco-friendliness, ease of availability, and low cost.
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