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reached 3. This solution is then back titrated with aqueous solution of sodium hydroxide (0.1M) until the pH was raised to 7. The number of equivalents of sodium hydroxide consumed is equal to the number of acrylate content of each sample (Rabiee et al. 2005). 2.5. Copolymer preparation from sodium acrylate and acrylamide (POLY2):
Sodium polyacrylate, also known as waterlock, is a sodium salt of polyacrylic acid with the chemical formula [−CH 2 −CH(CO 2 Na)−] n and has broad applications in consumer products. This super-absorbent polymer (SAP) has the ability to absorb 100 to 1000 times its mass in water. Sodium polyacrylate is an anionic polyelectrolyte with negatively charged carboxylic groups in the main chain.
