Chemical Modification of Guaran Gum. Part 2: Cyanoethylation

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 = kDⁿ 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.