Nucleation Activation and Spherical Crystals Morphology of LLDPE/LDPE/TiO_2 Nanocomposites Prepared by Non-Isothermal Crystallization

摘要

The nucleation activation of TiO_2 nanoparticles in the linear low-density polyethylene (LLDPE)/ low-density polyethylene (LDPE)/TiO_2 nanocomposites prepared by non-isothermal crystalliza_tion, the spherical crystals morphology of the etched LLDPE/LDPE and LLDPE/LDPE/TiO_2 composites were investigated by differential scanning calorimetry (DSC) and field-emission scanning electron microscopy (FE-SEM), respectively. The results showed that the heterogeneous nucleation activation of TiO_2 nanoparticles was accelerated by the fast cooling rate. The spherical crystals in the LLDPE/LDPE and LLDPE/LDPE/TiO_2 composites were ascribed to the same crystal structure. It was worth to note that there was distinct difference between the morphology of the cocrystallization LLDPE/LDPE crystals and that of the independent crystallization LLDPE/LDPE crystals.