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Kinetics of sonodegradation of poly(acrylic acid co acrylamide) hydrogels by viscometry

R.Ebrahimi, H.Ghasemzadeh Mohammadi

In thiswork ultrasonic degradation of one commercially important hydrogel based on acrylic acid and acrylamide was carried out in aqueous solution at room temperature (25°C). Also, the effect of power and pulse on the rate of degradation was investigated. A method of viscometry was used to study the degradation behavior of the hydrogel and a first order kinetic equation was employed to calculate the degradation rate constants. The experimental results indicated that the rate of ultrasonic degradation increased with increasing ultrasonic power and pulse. The degradation proceeds by mechanical forces and also involves radical scission mechanism.