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Effects of Lanthanum Oxide and Lanthanum Stearate on the Crystallization and Mechanical Properties of LLDPE

wallpapers News 2021-12-02
Effects of Lanthanum Oxide and Lanthanum Stearate on the Crystallization and Mechanical Properties of LLDPE
The effect of rare earth compounds lanthanum oxide and lanthanum stearate on the non-isothermal crystallization behavior of LLDPE (linear low-density polyethylene) was studied by DSC. As the concentration of lanthanum oxide and lanthanum stearate increases, the crystallinity of LLDPE tends to decrease. Lanthanum oxide can play the role of heterogeneous nucleation, which makes the crystallization rate of LLDPE faster, and the cooling crystallization peak moves to high temperature, while lanthanum stearate does not change the position of the crystallization peak and has no effect on the crystallization rate. Wide-angle XRD (X-ray diffraction) results showed that lanthanum oxide and lanthanum stearate did not change the crystal form of LLDPE, but in the system with lanthanum oxide, the grain size of LLDPE at 110 and 200 crystal planes increased significantly. Mechanical experiments show that lanthanum oxide slightly reduces the tensile strength of LLDPE, and the elongation at break has a significant drop. Lanthanum stearate has little effect on the tensile strength of LLDPE. However, the elongation at break has been greatly improved.
Through mechanical performance testing, DSC, wide-angle X-ray diffraction, and FTIR, the LLDPE added with lanthanum stearate and antioxidant 1010 was compared, and the effect of lanthanum stearate on the thermal aging behavior of LLDPE was studied. The crystallinity increases with the increase of thermal aging time. Compared with the system containing antioxidant 1010, the crystallinity of the system without antioxidant 1010 has a greater increase. Although lanthanum stearate can improve LLDPE in the high-temperature stage of thermal oxygen decomposition The stability of LLDPE does not change the thermal aging mechanism of LLDPE. In the pure LLDPE without antioxidant 1010 and the LLDPE system filled with lanthanum stearate, LLDPE has the same chain scission, branching, and Oxidation reaction, which leads to a decrease in the mechanical properties of LLDPE.
 

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