Study on mechanical properties and crystallization behavior of polypropylene and their blending toughened by β crystalline form nucleation agent

The influence of β crystalline form nucleation agent on the mechanical properties of PPH,PPR and PPH/PPR/PPB has been studied.In addition,Crystallization behavior has been investigated by polarizing microscope,DSC and wide angle X-ray diffraction spectrum.The result shows that the α crystalline form of PP is transformed to β crystalline form and the toughening effect of material is enhanced by adding β crystalline form nucleation agent.The Izod notched impact strength of PPH,PPR and PPH/PPR/PPB is separately increased by 100%,40% and 40%.Further more their elongation at break improves obviously without the decrease of tensile strength and bending strength.