▎ 摘　　要

In this work, polyethylene/graphene oxide nanocomposites were synthesized and characterized. The graphene oxide (GO) was first functionalized with vinylsilane groups, and then it was grafted (g) with polyethylene chains by in situ polymerization, using a metallocene/MAO catalytic system. Through this method the GO particles were exfoliated and homogeneously dispersed across the nanocomposites, which consisted of high-density polyethylene (HDPE) and polyethylene-g-GO hybrid. The polyethylene-g-GO hybrid was Soxleht extracted and analyzed. It was found that the morphology and thermal properties (crystallization temperature and enthalpy) of nanocomposites are markedly affected by small increments of GO. For the polyethylene-g-GO hybrids the crystallization was suppressed by confinement effects and anchoring, both reducing the chain mobility. Finally, the thermally treated (200 degrees C for 10 min) polyethylene/GO nanocomposites, prepared via in situ polymerization, showed a low percolation threshold (around 0.1 wt%) and good electric conductivity (10(-2) S cm(-1)).