Synthesis and Properties of Poly(sodium 2-acrylamido-2-methypropane sulfonate) Hydrogel Sheets and Effect of Adding Gelatinized Cassava Starch
Abstract
Hydrogel blends of poly(sodium 2-acrylamido-2-methylpropane sulfonate), P(Na- AMPS), and gelatinized cassava starch were synthesized and characterized. P(Na-AMPS) was synthesized by photopolymerization under UV-irradiation in aqueous solution using 0.1 mole %of 4,4'-azo-bis-(4-cyanopentanoic acid) as photoinitiator and 1 mole % of N,N’-methylene-bis-acrylamide (NMBA) as crosslinking agent. The P(Na-AMPS) was then blended with gelatinized cassava starch in various v/v % ratios of 100:0, 97:3, 95:5 and 90:10 or w/w ratios of 100:0, 97:0.15, 95:0.25 and 90:0.50. Characterization was carried out by means of FT-IR and TGA. Polymerization was confirmed by the disappearance of the C=C peaks of the Na-AMPS monomer at 1417 and 950 cm-1 in the FT-IR spectrum. Subsequent testing of the hydrogel blends showed that the best combination of water content, water retention and mechanical properties were obtained in the case of the 95:5 % v/v blend.
Keywords : hydrogel, gelatinized cassava starch, poly(sodium 2- acrylamido-2-methylpropane sulfonate), UV-irradiation, photoinitiation
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