THE SYNTHESIS OF A WATER SUPERABSORBENT MATERIAL FROM STRAW FIBER: THE EFFECT OF THE CATALYSTS
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https://doi.org/10.54939/1859-1043.j.mst.75.2021.94-100Keywords:
Superabsorbent polyme; Acrylamide; Cellulose; Graft copolymer.Abstract
The superabsorbent material (Bio-SAP) from cellulose were synthesized by graft polymerization of acrylamide onto cellulose using N,N'-methyl bisacrylamide (MBA) as the cross-linking agent. In this study, two different catalyst systems were used: potassium persulfate (KPS) and potassium persulfate/ascorbic acid (KPS/AAs). The effect of catalyst type and catalyst content on polymerization such as gel content, mechanical properties, water absorption and thermal properties of the products were studied. When comparing two catalyst systems KPS and KPS/AAs, it showed that the gel content, maximum water absorption and mechanical strength of samples obtained by using KPS/AAs catalyst system are higher than that of KPS. The optimal KPS/AAs content is 1,25% by monomer weight. Finally, Bio-SAP materials with KPS/AAs catalyst have some characteristics: gel content is 98.1%, water absorption in distilled water is 320,8 g/g and in saline is 63,5 g/g, tensile at break strength 162,5 kPa and elongation at break 31,8%.
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