Abstract
Polymerization utilizing ultrasonic has been widely studied. As the polymerization is progressed, physical and chemical properties of the solution are changed due to change of the concentration of polymer and monomer in the solution. Though this environmental change is considered to affect the creation of the sonication bubbles, generation of the radicals and diffusion properties of solutes, the effect has not been well understood. In this study, polyethylene glycol and polyethylene oxide which were chemically synthesized and are considered not to induce the ultrasound polymerization were used to control the environment of the solution. Radical concentration labeled by HTIO was measured by ESR during sonication in laboratory made cell. It was found that the radical generation is affected by chain ends when both of the ends are OH while it is not when either side of the chain is CH_3.
