Abstract
Ultrasound (US) was used to investigate change of the viscosity of aqueous solutions of copolymer having Acrylic Acid (AA) and N-hydroxyethyl acrylamide (HEAA) segments. The US effect on the shear viscosity of the copolymer containing 25mol % HEAA group was examined at different US intensities (10-50 W) of frequencies (23, 43, 96 and 143 kHz) for several exposure times (1- 5 min). The US effect showed decrease of the shear viscosity in the exposure to each US. The FT-IR spectra showed a substantial change to 23 that 43, 96 and 141kHz.
