Synthesis Of The New Ruthenium Complexes Catalyst And It’s Activity For Dicyclopentadiene Polymerization

Dicyclopentadiene derived from C5 fractions of petroleum cracker for ethylene production, with rich source, inexpensive, two unsaturated double bonds, active chemical properties, has gained with a wide range of applications in polymer materials and fine chemical industries, especially, it becomes an important new thermoset polymer engineering materials with excellent mechanical properties, chemical resistances and thermal stability and obtained more applications in transportztion, sports facilities, construction materials, electrical equipments, communications and other fields,In this paper, the synthesis of a new [(PCy3)2Cl2Ru=CHCH2OPh] ruthenium carbene catalyst is reported, nuclear magnetic resonance and infrared spectroscopy are used to characterize the structural features. The new ruthenium carbene catalyst has been successfully tested in the ring-opening metathesis polymerization (ROMP) of dicyclopentadiene(DCPD). The effect of polymerization conditions on the catalyst activity is investigated. The optimal polymerization conditions are as follows:the reaction temperature is 60℃, the reaction time is 4 h and the molar ratio of the catalyst to dicyclopentadiene is 1:600. Under these conditions, the conversion of dicyclopentadiene is 99.8%. This result show that the catalyst exhibits good catalytic activities in the polymerization of dicyclopentadiene.Dolydicyclopentadiene is analyzed by FT-IR spectroscopy and X-ray diffraction, it is proved that the polymerization of dicyclopentadiene by the catalyst follows the ring-opening metathesis polymerization mechanism, forming crosslinked network structure, with less crystalline. Acid-base corrosion study showed that polydicycl-opentadiene weight loss rate of less than 8% in 30 days, with good acid and alkali resistance.Through the polymer matrix in situ polymerization, polydicyclopentadiene/Al2O3 composite was prepared, the appropriate dosage of Al2O3 was determined as 1.0%. by the gel time measurement, dispersion test, X-ray diffraction and thermogravimetric curve analysis.