Abstract
Amphiphilic block copolymer films having phase separation layer of polyethylene oxide (PEO) segments and azobenzene ones were exposed to ultrasound (US) (43kHz, 28W) in water (25℃ and 80℃) for 30min. Then, the surface morphology was measured with Atomic Force Microscopy (AFM). It was observed that the PEO moiety in the block copolymer was effectively swelled by the US exposure. It meaning that the US enhanced swelling of the PEO segments of the film.
