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Chemical Modification of Guaran Gum. Part 2: Cyanoethylation
Author(s) -
Ragheb A.,
EiThalouth I. Abd,
Amer M. Abou,
Nassar S. H.,
Kamel M.
Publication year - 1993
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.19930450708
Subject(s) - shear thinning , guar gum , rheology , shear rate , chemistry , nitrile , viscosity , apparent viscosity , polymer chemistry , chemical engineering , organic chemistry , materials science , food science , composite material , engineering
Guar gum was cyanoethylated under a variety of conditions. It is shown that the extent of reaction increases by increasing the acrylo‐concentration nitrile and decreases by increasing the reaction temperature. Cyanoethyl guaran pastes are characterized by non‐Newtonian pseudoplastic behaviour and may be described by the power low T = kD n in which the rheological parameters k and n depend mainly on the type of the derivatives. The apparent viscosity of these derivatives depends on its nitrogen content as well as the rate of shear.