A study on the effect of the concentration of N,N-methylenebisacrylamide and acrylic acid toward the properties of Dioscorea hispida-starch-based hydrogel

Abstract

Abstract. The research investigated the effects of acrylic acid (monomer) and N,N,-methylenebisacrylamide, MBA (crosslinker) toward the percentage of gel content, swelling ratio and ionic strength of a starch-based hydrogel. Starch grafted on poly (sodium acrylate), St-g-PAANa hydrogel was prepared by incorporating starch extracted from Dioscorea hispida in NaOH/aqueous solution using different composition of acrylic acid (AA) and N,N-methylenebisacrylamide (MBA) in the presence of potassium persulfate (KPS) as chemical initiator. The highest gel content was observed at 1:30 ratio of starch to AA and 0.10 M of MBA. Results showed the highest swelling ratio was observed at 1:15 ratio of starch to acrylic acid and 0.02 M of MBA solution. The same results also gave the highest swelling ratio for the ionic strength study. The FTIR analysis was also conducted in order to confirm the grafting of AA onto starch backbone.

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“…Therefore, DEE and dynamic swelling are directly correlated, i.e., the highe nanogels' swelling, the higher their DEE will be. Similarly, a significant decrease in was observed with the increasing concentration of MBA, i.e., 2%, 4%, and 6% (Figur An increased MBA concentration in nanogels caused an increased crosslinking de between polymeric networks and a decreased water uptake by the nanogel, whic sulted in a poor swelling index and lower DEE [36]. However, increasing the gelatin concentration had no definite effect on the swelling of the nanogel [30][31][32].…”

“…This decrease in the swelling index can be explained by the reduction of the mesh size of nanogels and the formation of a more compact, highly crosslinked structure. Inside this compact structure, carboxylate groups hide, and the ionization process decreases, which is responsible for nanogels swelling less [36,37].…”

“…Similarly, a significant decrease in DEE was observed with the increasing concentration of MBA, i.e., 2%, 4%, and 6% (Figure 8c). An increased MBA concentration in nanogels caused an increased crosslinking density between polymeric networks and a decreased water uptake by the nanogel, which resulted in a poor swelling index and lower DEE [36].…”