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Carboxymethylation of Cassia tora gum
Author(s) -
Sharma Brij Raj,
Kumar Vineet,
Soni P. L.,
Sharma Pradeep
Publication year - 2003
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.12430
Subject(s) - cassia tora , chemistry , sodium hydroxide , solubility , aqueous solution , polymer chemistry , carboxymethyl cellulose , solvent , shear thinning , nuclear chemistry , organic chemistry , sodium , viscosity , materials science , medicine , alternative medicine , pathology , composite material
The preparation of carboxymethyl (CM)– Cassia tora gum (CTG) with monochloroacetic acid and sodium hydroxide was investigated under different reaction conditions. The carboxymethylation reaction was studied with respect to the degree of substitution of CM–CTG. The variables studied were the concentration of reactants, methanol–water ratio (solvent), reaction time, and reaction temperature. Carboxymethylation of CTG increased its solubility in cold water and the stability of its paste to microorganisms. Regardless of the degree of substitution of these products, their aqueous solutions were characterized by non‐Newtonian pseudoplastic behavior. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3216–3219, 2003