Study Of Rheological Behavior, Crystallization Kinetics, Mechanical Properties And Ultraviolet Aging Resistance Of Metallocene Polyethylene/Inorganic Nano-composites

In this study, different composition blends of inorganic nanomaterial/mPE were made by melt blending way. Rheological behavior, crystallization kinetics, mechanical properties and ultraviolet aging resistance was studied. Theoretical basis for mPE blends's further functional and processing application are provided.1. Melting behavior and nonisothermal crystallization kinetics of Metallocene Polyethylene were studied using differential scanning calorimetry (DSC) at various scanning rates. The Avrami equation modified by Jeziorny and a method developed by Mo were employed to describe the nonisothermal crystallization process of mPE. The theory of Ozawa was also used to analyze the mPE DSC data. Kinetic parameters such as the Avrami exponent (n), the crystallization rate (Zc), the peak temperatures (Tp) and the half-time of crystallization (t1/2) etc. could obtain at various scanning rates. The results showed that the Ozawa analysis failed to provide an adequate description of the nonisothermal crystallization of mPE. The Avrami equation modified by Jeziorny and a method developed by Mo were fit for describing the nonisothermal crystallization process of mPE. The value of n was showed that the nonsiothermal crystallization of mPE corresponds to a tridimensional growth with heterogenous, and the value of Zc increase with increasing of the cooling rates for mPE.2. Different composition of mPE/nano-TiO2 blends were made by melt blending way. Rheological behavior and Mechanical Properties of metallocene blends were studied. Influences of shear ratio, shear stress and different temperatures on rheological behavior and melt apparent viscosity were discussed. Non-Newtonian index (n), melting flow rate (MFR), conventional yield stress, breaking stress and breakingextensibility of the blends with different composition were measured. Nonisothermal crystallization kinetics of mPE and the blends of mPE/nano-TiO2 were studied using differential scanning calorimetry (DSC) at various scanning rates. Influences of differential contents of nano-TiO2 on nonsiothermal crystallization kinetics were discussed.3. Different composition of mPE/nano-TiO2. mPE/nano-ZnO . mPE/nano-CaCO3 blends were made by melt blending way. Ultraviolet aging resistance on the properties of PE/nano-material composites were studied. The effect of ultraviolet aging time on the properties of mechanicaK melting viscosity. crystallization temperature and IR were discussed. The results showed that the resistance aging properties of composites material were greatly improved by addition of nano-TiO2 and nano-ZnO.