Superabsorbent Polyelectrolyte based on a Crosslinked Acrylic Acid Copolymer

Superabsorbent Polyelectrolyte based on a Crosslinked Acrylic Acid Copolymer 

Safety precautions Before this experiment is carried out. Sect. 2.2.5 must be read as well as the material safety data sheets (MSDS) for all chemicals and products used.The reaction should be carried out in a hood. 

The following example describes the synthesis of a superabsorbent via crosslinking copolymerization of acrylic acid (sodium salt) with A/,A/ -methylenebis(acrylamide). 

In a 600 ml glass beaker equipped with a magnetic stirrer and a thermometer 25 g acrylic acid, 0.1 g methylene blsacrylamide,and 0.12 g sodium carbonate are dissolved in 60 ml dist. water. 0.7 ml of an aqueous sodium peroxodisulfate solution (Na2520g, 

10 wt%) are added slowly at room temperature to the reaction mixture in the beaker. The mixture foams strongly and a temperature increase can be observed when the addition is too quick. One has to be careful that the temperature does not exceed 25 °C. If necessary cooling is applied briefly but removed afterwards.The mixture should be set to pH 4.9. 

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Example 5.11 Superabsorbent Polyelectrolyte Based on a Crosslinked Acrylic Acid Copolymer... 

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