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On the Hydrolysis of Polysuccinimide for Preparation of Polyaspartic Acid

The appropriate conditions of the hydrolysis of polysuccinimide determined by means of an orthogonal experimental design were 2 mol/L NaOH(in water), 0.45～0.48 g NaOH/g polysuccinimide, 50～90 ℃ and 30 min. The effects of temperature, time, concentration and amount of NaOH on the scale inhibition capacity and molecular weight(M w) of the hydrolysis products were investigated. The polymers were characterized by IR, 13C NMR , 1H NMR and TG-DTA. The reaction temperature is all important affecting the molecular weight of the product and the kinetics of hydrolysis reaction is deduced to be a 2nd order cascade type reaction.