Norbornene polymerization was first carried out by (dienzoylmethanato)2Ti(OPh)2[(dbm)2Ti(OPh)2]／methylaluminoxane (MAO)

a type of β-diketonate titanium non-metallocene catalytic system．A mixture of vinyl addition polymer and ring-opening metathesis polymer was obtained．Polymer structure was characterized by FTIR．Influence of polymerization temperature

Al／Ti mole ratio

monomer concentration and solvents on polymerization activity as well as on polymer structure was investigated．Higher activity was achieved at 80℃ with higher Al／Ti mole ratio and monomer concentration as well as 1

2-dichlorobenzene as the solvent instead of toluene．Higher temperature

higher Al／Ti mole ratio

lower monomer concentration have the advantage of forming more ring-opening polymer structure and less addition polymer structure．