| Abstract Using the cassava oxidized starch has been synthesized carbamoylethyl starch(CES)with different degrees of substitution( D.S ).By analyzing the effect of the concentration of NaOH,reaction time,reaction termperature and the weight of acrylamide on the D.S (N). D.S (Na)of etherified products and the total rate of etherification,we studied the side reaction of synthesizing carbamoylethyl starch.Results show that the extent of reaction of strach with acrylamide is governed by aforementioned factors.Furthermore,the best etherification conditions are the weight of acrylamide[0 2mol/mol (starch)],the concentration of NaOH(0 1 mol/L),reaction temperature(40℃),reaction time (4h).When the side effcct on carbamoylethylation is the weakest,the total of rate of etherification reaches 72 6%. |
|
1999, Vol. 16 
