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Studies on graft copolymerization of 4‐vinylpyridine onto guar gum
Author(s) -
Taunk Kavita,
Behari Kunj
Publication year - 2002
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.10558
Subject(s) - grafting , guar gum , copolymer , guar , chemistry , thioacetamide , nuclear chemistry , polymer chemistry , sulfuric acid , thermogravimetric analysis , thermal stability , aqueous solution , materials science , organic chemistry , polymer , food science , biochemistry
Graft copolymerization of 4‐vinylpyridine (4‐VP) onto guar gum (GOH) using potassium monopersulfate (PMS)/thioacetamide (TAA) as a redox pair was studied in an aqueous medium under inert atmosphere. The concentration of potassium monopersulfate and thioacetamide should be 1.0 × 10 −2 and 5.0 × 10 −3 mol dm −3 , respectively, for highest grafting ratio and efficiency. Efficient grafting was observed at 19.25 × 10 −2 and 4.87 × 10 −2 mol dm −3 concentration of 4‐vinylpyridine and sulfuric acid, respectively. The optimum temperature for grafting is 30°C. As the time period of reaction is increased, the grafting ratio increases, whereas efficiency decreases. The plausible mechanism of grafting has been suggested. A sample of guar gum and guar‐ g ‐4‐vinylpyridine were subjected to thermogravimetric analysis with the objective of studying the effect of grafting 4‐vinylpyridine on the thermal stability of guar gum. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 2380–2385, 2002