The kinetics of the ultrasonic degradation of aqueous solution of poly-acrylamide and poly(ethylene oxide) as well as ultrasonic block copolymeriza-tion of aqueous solution of the mixture of polyacrylamidepoly (ethylene oxide) were studied respectively. The degradation reaction of poly (ethylene oxide) follows a linear relationship between 1/ (Pt - P) and irradiation time

while that of polyacrylamide follows a linear relationship between 1/ (Pt - P)1/2 and irradiation time. As the structure of the copolymer was identified by IR

DTA and NMR

the hydrogen atoms in polyacrylamide remain unchanged

and the copolymer prepared is a block copolymer.