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Cyanoethylation of Cassia tora Gum
Author(s) -
Sharma Brij Raj,
Kumar Vineet,
Soni Purshottam L.
Publication year - 2003
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.200390004
Subject(s) - cassia tora , acrylonitrile , chemistry , sodium hydroxide , cassia , nuclear chemistry , polymer chemistry , organic chemistry , copolymer , polymer , medicine , alternative medicine , pathology , traditional chinese medicine
Cyanoethylation of Cassia tora gum was carried out with acrylonitrile in presence of sodium hydroxide under different reaction conditions. Variables studied were concentrations of sodium hydroxide and acrylonitrile, reaction temperature and time. The degree of substitution, reaction efficiency and total extent of etherification were determined. The optimum conditions for preparing cyanoethyl Cassia tora gum (DS 0.44) were 0.608 mol acrylonitrile and 0.625 mol sodium hydroxide at 30 °C for 4 h. Rheological properties of cyanoethyl Cassia tora gum solutions showed non‐Newtonian pseudoplastic behavior regardless of the degree of substitution (DS). At a constant rate of shear the apparent viscosity of cyanoethyl Cassia tora gum solutions increased with the increase in %N of the product.