Synthesis and Study of Polyacids from Soluble Starch and Chloroacetic Acids

Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt

Manuscript received 24 June 1985, accepted 25 June 1986

The optimum conditions for the condensation of soluble starch with sodium salt of monochloroacetic acid in aqueous sodium hydroxide solution are determined. Condensa­tion of soluble starch with sodium salt of di- and tri-chloroacetic acids was carried out under the same optimum conditions found for the former reaction. Higher values of yield, acid number, specific viscosity and consequently degree of substitution are attained upon repeating the process of carboxyalkylation for at least three times.