Alginic acid‐g‐poly(N‐vinylformamide) graft copolymer: Synthesis, characerization, swelling, and flocculation property

Abstract

The graft copolymer of N-vinylformamide with alginic acid was synthesized by free radical polymerization using potassium peroxymonosulphate and thiourea as redox pair in inert atmosphere. The optimum conditions for maximum grafting have been determined by varying the concentrations of N-vinylformamide, potassium peroxymonosulphate, thiourea, sulfuric acid, alginic acid as well as time duration and temperature. The grafting parameters increase up to the certain concentrations of N-vinylformamide, potassium peroxymonosulhate, thiourea, and hydrogen ion while thereafter grafting parameters decrease. The effect of alginic acid concentration on grafting parameters has been observed to decrease continuously. It has also been found that grafting parameters increase up to certain time and temperature, respectively, and thereafter decrease. The swelling properties of graft copolymer in terms of swelling ratio and percent swelling are investigated. Flocculation property of pure and grafted sample for both coking and noncoking coals is also investigated for the treatment of coal mine waste water. The graft copolymer has been characterized by Fourier transform infrared spectroscopy as well as thermogravimetic analysis.

Modification of alginate through the grafting of 2-acrylamidoglycolic acid and study of physicochemical properties in terms of swelling capacity, metal ion sorption, flocculation and biodegradability

“…This technique enables the production of new hybrid polymer materials with desired properties (Fakhru'L-Razi et al, 2001;Patel, Patel, & Trivedi, 1999;Pourjavadi, Hosseinzadeh, & Mazidi, 2005). In order to increase our contributions, various graft copolymers have already been synthesized by grafting different types of vinyl monomers onto natural polysaccharides in our laboratory earlier (Mishra, Tripathy, Srivastava, Mishra, & Behari, 2008b;Mishra, Yadav, Tripathy, Sand, & Behari, 2010;Sand, Yadav, Mishra, & Behari, 2010a;Sand, Yadav, Mishra, & Behari, 2010b;Tripathy, Mishra, & Behari, 2009;. In the present study, an attempt has been made to enhance the properties of such a new type of natural polysaccharide as alginate easily available among various natural polysaccharides.…”

Chemical Modification of Marine Polysaccharide (Alginate) By Free-Radical Graft Copolymerization― a Short Review

“…These synthetic approaches include the combination of polysaccharides with other polymers. Grafting of vinyl monomers onto polysaccharides via radical polymerization has attracted the interest of many researchers in the last two decades [1]. However, the methods employed for grafting vinyl monomers onto polysaccharides are different from that of grafting non vinyl monomers.…”