Effect of ultrasonic vibrations of polymer films

Surface functionalization of cyclic olefin copolymer with aryldiazonium salts: A covalent grafting method

“…It could be inferred that after 3 h, the NO 2 group is hidden in the multilayer. Ultrasonic waves could also generate cracks on the surface [49] that disorganize and destroy the upper layer of nitrophenyl film. We confirmed this conclusion by measuring the intensity of the 1600 cm −1 band, which was higher before ultrasonic treatment (Fig.…”