Modification of guar gum through grafting of 4‐vinyl pyridine using potassium peroxymonosulphate/ascorbic acid redox pair

Abstract

In the present article, the graft copolymerization of 4‐vinyl pyridine onto guar gum initiated by potassium peroxymonosulphate/ascorbic acid redox pair in an aqueous medium was studied gravimetrically under a nitrogen atmosphere. Grafting ratio, grafting efficiency, and add on increased on increasing the concentration of potassium peroxymonosulphate from 5.0 × 10−4 to 10 × 10−4 mol/L and ascorbic acid concentration from 0.4 × 10−3 to 2.0 × 10−3 mol/L. On increasing the hydrogen ion concentration from 2.5 × 10−3 to 10.0 × 10−3 mol/L, grafting ratio, efficiency, add on and conversion were increased. Maximum grafting was obtained when guar gum and monomer concentration were 1.0 g/L and 20.0 × 10−2 mol/L, respectively. An increase in temperature from 30 to 35°C increased the grafting ratio, but conversion and homopolymer decreased. The graft copolymers were characterized by IR spectroscopy and thermogravimetric analysis. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007

Synthesis, characterization, and properties of cashew gum graft poly(acrylamide)/magnetite nanocomposites

“…The IR spectra of CG [Figure (a)] display a broad band at 3414 cm – , which is the OH stretching vibration. The IR band located at 2930 cm −1 is attributed to the stretching of CH group and the strong signal appeared at 1648 cm −1 is due to the OH scissor vibration from bonded water molecules . The absorption peak appeared at 1420 cm −1 is related to the angular deformation of CH 3 group of polysaccharide.…”

“…The IR band located at 2930 cm 21 is attributed to the stretching of CH group and the strong signal appeared at 1648 cm 21 is due to the OH scissor vibration from bonded water molecules. 20 The absorption peak appeared at 1420 cm 21 is related to the angular deformation of CH 3 group of polysaccharide. The peaks obtained at 1160, 1086, and 1028 cm 21 are owing to the stretching vibrations of CAOAC from the glucosidic bonds and OH absorption from alcohol.…”

Graft copolymerization of 4‐vinyl pyridine onto konjac glucomannan initiated by ammonium persulfate

“…1,19,26 On the other hand, 4-VP had a high affinity for its homopolymer substrate, which meant that the homopolymerization occurred in the polymer phase to a large extent. Thus, it is likely that homopolymerization had more chances to occur, and as a result, a decrease in G% and E% was observed.…”

“…This is a quite promising method for improving the potential applications by introducing desired properties and thus enlarging the scope of abundantly available polysaccharides. 1 Konjac glucomannan (KGM) is a high-molecularweight, water-soluble nonionic polysaccharide, which can be extracted from tubers of the amorphophallus konjac plant in large quantities. It is a linear random copolymer of b-(1,4)-linked D-mannose and D-glucose, and the ratio of mannose to glucose is 1.6 : 1 (Fig.…”

Gellan gum-g-N-vinyl-2-pyrrolidone: Synthesis, swelling, metal ion uptake and flocculation behavior

“…This technique enables the production of new hybrid polymer materials with desired properties [6,7].Various graft copolymers have been synthesized by graft copolymerization of vinyl monomers onto natural polysaccharides in our laboratory [8][9][10][11]. In the present study, an attempt has been made not only to increase the paramount contribution towards their industrial applications but also to enhance the properties of such new type of natural polysaccharide as gellan gum among various natural polysaccharides, which is widely, used water soluble polysaccharide.…”