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Modification of guar gum through grafting of 4‐vinyl pyridine using potassium peroxymonosulphate/ascorbic acid redox pair
Author(s) -
Srivastava Abhishek,
Tripathy Jasaswini,
Mishra Madan Mohan,
Behari Kunj
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26575
Subject(s) - grafting , ascorbic acid , guar gum , copolymer , guar , polymer chemistry , chemistry , nuclear chemistry , monomer , potassium , materials science , organic chemistry , biochemistry , polymer , food science
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