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.