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Graft copolymerization of methacrylic acid onto xanthan gum by Fe 2+ /H 2 O 2 redox initiator
Author(s) -
Kumar Rajesh,
Srivastava Arti,
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.26245
Subject(s) - grafting , methacrylic acid , xanthan gum , copolymer , hydrogen peroxide , nuclear chemistry , chemistry , polymer chemistry , thermogravimetric analysis , reagent , materials science , polymer , organic chemistry , rheology , composite material
The graft copolymer of xanthan gum with methacrylic acid was synthesized in inert atmosphere by using Fentos reagent as a redox initiator. The effect of reaction conditions on grafting parameters [ G (%), E (%), C (%), A (%), H (%), and R g ] was investigated. Similar trend was observed on increasing the concentration of ferrous ion and hydrogen peroxide from 4.0 to 20.0 × 10 −3 mol dm −3 and 2.5 to 10 × 10 −3 mol dm −3 respectively, i.e., initially grafting parameters increased and after a certain range of concentration grafting parameters showed decreasing trend. Hydrogen ion shows influenced result i.e., small increment of concentration in hydrogen ion presents much increment in percent of grafting. It was observed that the [ G (%), E (%), C (%), A (%), and R g ] increased upto 6.67 × 10 −2 mol dm −3 concentration of methacylic acid after that it decreased. Maximum G (%) was obtained at minimum concentration of xanthan gum i.e., at 40 × 10 −2 g dm −3 . The optimum temperature and time duration of reaction for maximum percentage of grafting were found to be 45°C and 150 min respectively. Thermogravimetric analysis showed that the xanthan gum‐ g ‐methacrylic acid is thermally more stable than pure gum. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007