Hysteresis Heat Build-up and Low Temperature Processing of Polymer under the Vibration Force Field

By using dynamic capillary and multi-dimensional vibration experiment desktop, isotactic polypropylene (iPP) is selected for the objective material to investigate the effect of the vibration parameters on the viscoelastic properties of polymer and its molding process. And a series conclusions can be draw that: The phase angle of polymer tends to decrease after a increase with vibration frequency increasing. The phase angle reach maximum value of 90 degrees when the vibration frequency equals to the material natural frequency. Which polymer experience as pure viscous materials, also hysteresis heat build-up rate goes up to the peak. The plasticizing rate of polymer increase as the vibration amplitude, but the higher requirement for the equipment leveled up as well. The polymer plasticizing rate display the same law with that of phase angle against vibration frequency. When the vibration frequency equals to the material natural frequency, the plasticizing rate reach maximum. The investigation of this study will offers valuable theoretical references for polymer processing and novel equipment design in low-temperature.