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Article
Studies on Water Absorbency of Polyacrylamide Hydrogels
Author(s)
Bhadani Reena1* and Mitra Uttam Kumar2
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DOI:10.17265/2161-6221/2015.11-12.001
Affiliation(s)
1. Department of Chemistry, Ranchi Women’s College, Ranchi University, Ranchi-834001, India
2. Department of Chemistry, Gossner College, Ranchi University, Ranchi- 834001, India
ABSTRACT
The polymerization was carried out under the different concentrations of acrylamide and crosslinker in an aqueous solution of NO2 gas as initiator at 50 ºC. The resulting polyacrylamide was saponified with NaOH solution. The hydrolysed polymers show high degree of water swelling (> 500) than that of unhydrolysed polymers (< 100). Swell ability of the gel decreases with the increasing concentration of N, N’- methylene bisacrylamide – a crosslinker which enhances the degree of crosslinking in the polymer chains. The increased crosslinking restricts the expansion of polymer network which causes the lowering of the water absorbency. It was observed that polymer hydration increased with the molar mass of polyacrylamide. The swell ability of polyacrylamide hydrogels is greatly lowered by the addition of ionic salts in the swelling medium. Both ionic strength and valency of the salts are responsible to decrease the water uptaking capacity of the gels which remain unaffected by nondessociating nature of urea. The hydrogels, so prepared, are stable and quite able to undergo swelling - deswelling cycles suggesting their reversible characters.
KEYWORDS
Polymerization, initiator, crosslinker, polyacrylamide hydrogels, ionic salts.
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