Study On Rheological Behavior And Shear Induced Crystallization Behavior Of Ipp/Nano-particles Composite

This paper used aluminate coupling agent and Ar plasma modified nano-CaCO3and nano-ATP to improve the compatibility with iPP. iPP/nano-particle compositeswere prepared. Rheological performance and flow-induced crystallization of thecomposite were studied.The torque-time curves were recorded as the composite making. Through theequilibrium torque value we can see the viscosity information of these composites.SEM was used to observe the nano-particle in iPP matrix. We can see that themodified nano-particles showed a better dispersion in iPP matrix.Rotational rheometer was used in this paper. First, we used strain sweep mode todetermin the composite linear viscoelastic area, strain less than1is the linearviscoelastic area of iPP/nano-CaCO3, while0.6is the linear viscoelastic area ofiPP/nano-ATP when the ATP content was more than3%. If the strain was larger than1or0.6, the composite had the characters of nonlinear behavior, and then the modulusbegan to decline.Frequency sweep mode was used to get the information of viscosity and modulusof composite. In the low frequency region, the loss modulus is greater than the storagemodulus, the composite performed viscosity; with the frequency increase, storagemodulus will larger than loss modulus, the composite performed elasticity.The plate rheometer was used as a flow field, the crystallization behavior of thepure polypropylene and composite materials were studied. Viscosity mutation andnormal stress mutation were the two kinds of methods to characterize thepolypropylene shear induced crystallization time. Temperature、 shear rate、nano-particle filling content and nano-particle morphology factors on polypropylenewere studied.