Long-branching polyethylene was prepared by using a novel dual-functional catalytic system with (acac)2 ZrCl2／Montmorilonite／AIEt2Cl as the ethylene oligomerization catalyst in which (acac)2ZrCl2 was chemically bonded in between the layers of montmorilonite (MMT) and Et(Ind)2ZrCl2／MAO as the ethylene copolymerization catalyst capable of incorporating ethylene oligomers

of which over 80 percent were hexene and octene

in situ to form long-branching polyethylene．Selectivities for ethylene digomerization with (acac)2ZrCl2 and (acac)2ZrCl2／MMT

relationship between (acac)2ZrCl2 and(acac)2ZrCl2／MMT with reaction time

effects of Al／Zr value on activity of (acac)2ZrCl2／MMT and structure of the resulting polymer were investigated．Experimental results showed that the two catalysts in the dual-functional catalytic system were well matched and exhibited high copolymerization activity and improved properties of the final long-branching polyethylene．