Carbon nanospheres (CSs) treated with Grignard reagent were used as carrier

which reacted with TiCl4to form supported Ziegler-Natta catalyst.In the presence of AlEt3

this catalyst catalyzed ethylene polymerization to obtain PE/CSs composites in situ.The catalytic activity for ethylene polymerization was up to 5.7106 gPE/(molTi h) and the weight average molecular weight of the obtained polymer was 4.9105.As characterized by TEM and SEM

the particles of obtained composites were spherical with diameters of about 1 m

furthermore

they featured a core-shell structure as expected.The dielectric analysis results indicated that compared with normal polyethylene

by the introduction of carbon nanospheres the PE/CSs composites dielectric properties experienced an obvious increase

which improved the anti-static function of PE.The dielectric result showed a slight decline of the dielectric constant of PE/CSs composites with increase of the polymerization time

and lower dielectric loss was also observed due to the decrease of CSs content in PE/CSs composites.Moreover

the crystalline properties and thermal stability of the PE/CSs composites were determined by WAXD

DSC and TGA.It turned out that PE/CSs composite possessed good crystalline properties and thermal stability.