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)

Study on the Morphology and Properties of PP/HDPE Blend Prepared by Vibration Injection Molding
(41 – 50) Journal of Macromolecular Science, Part B - Physics 50  #1 (2011)
Zhang et al of Sichuan University, China showed the tensile strength and impact strength increase with increasing vibration frequency and vibration pressure.  SEM micrographs show that the orientation degree of the vibration sample obtained at 190°C obviously increases compared with the static sample, and the clusters of lamellae are stretched along the flow direction, whereas their lateral sizes decrease correspondingly.  DSC testing results show that the degree of crystallinity of vibration samples are higher than those of static samples.  (RDC 11/23/2010)

Self-Reinforced High-Density Polyethylene Prepared by Low Frequency Vibration-Assisted Injection Molding. II: Microstructure Investigation
(242 – 249) Journal of Macromolecular Science, Part B - Physics 49 #2 (2010)

Self-Reinforced High-Density Polyethylene Prepared by Low-Frequency, Vibration-Assisted Injection Molding. 1. Processing Conditions and Physical Properties
( 736 – 744) Journal of Macromolecular Science, Part B - Physics 48 #4 (2009)