Polyacrylonitrile (PAN) was dissolved by the cavitation effect of ultrasonication

and the viscosity of the solution was measured using rotational viscometer

and was compared with the conventional solution by stirring. Ultrasonic treatment could accelerate the dissolution process and reduce the viscosity of the system

which were based on the transformation of the swelling method. The influence on polymer chain structure of ultrasonic was also investigated. Longtime ultrasonic treatment could reduce the relative average molecular weight

and a broader molecular weight distribution was observed. A modeling analysis was built for the ultrasonic treatment of PAN by Matlab. The motion model of vacuole nuclei suitable for the PAN dissolution system was constructed. The influences of the main factors

such as ultrasonic frequency

ambient pressure

surface tension and viscosity were calculated. Viscosity played a vital role in the effect of ultrasonicat