Synthesis of ring-opening metathesis polymer from cycloolefin
The ring-opening metathesis polymer of norbornene-tetracyclododecene was synthesized by using the Ziegler-Natta catalyst with MoCl5 as the core,and a stable monomer conversion of 100％ and gel fraction of 0％ were achieved. The polymers were heterogeneously hydrogenated by using Al2O3 supported Ru metal catalyst and SiO2/Al2O3 supported Ni metal catalyst. A 100％ hydrogenation efficiency could be achieved, and the catalyst could be completely separated from the polymer solution by simple filtration. The products of the two hydrogenation catalysts have different properties. The melt flow index of the hydrogenation product of Ni catalyst is more than 76 g·min-1 and the glass transition temperature is 126 ℃ when mass of total solids feeding is 10％ of polymer weight,190 ℃,4 MPa pressure of initial hydrogen and 2 h of reaction time,while the melt flow index of the hydrogenation product of Ru catalyst is 10 g·min-1 and the glass transition temperature is 131 ℃ when mass of total solids feeding is 2％ of polymer weight,180 ℃,4 MPa pressure of initial hydrogen and 2 h of reaction time.
fine chemical engineeringring-opening metathesis polymerizationheterogeneous hydrogenationcyclic olefinscyclic olefin polymers ( COP)molybdenum chloriderutheniumnickel
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