Study on Creep Behavior of PP/CaCO3 Molded by Vibration Injection Molding at Different Vibration Frequency and Vibration Pressure
(136-142)  International Polymer Processing #2 (2011)
Lu, Peng and Yan ofSichuan University, China studied the creep behavior of the calcium carbonate filled polypropylene (PP/CaCO3) prepared at various vibration conditions.  The influences of the vibration pressure and the frequency on the mechanical properties and creep behavior were investigated via creep test and tensile test.  Firstly, the tensile fracture strain reached the maximum (11%) at 0.72 Hz.  Moreover, with the increasing vibration pressure amplitude, the tensile fracture strain would decrease.  The changing tendency of tensile strength is basically contrary with the change of the tensile fracture strain.  Secondly, when the vibration frequency reaches the 0.72 Hz, the tensile creep is larger than that of other frequencies samples at 50 MPa; meanwhile, the tensile creep of these PP/CaCO3 parts, which has been prepared at 0.48 Hz, decreases with the increasing vibration pressure amplitude.  (RDC 5/23/2011)