Ring-Opening Metathesis Polymerization of Cycloolefens Using Tungsten-Tetraphenylporphyrinate Catalysts

摘要: Ring-opening metathesis polymerisation of cycloolefins (e.g. cyclopentene, cyclooctene, cyclododecene, dicyclopentadiene) has been investigated in the presence recently reported catalytic systems consisting tungsten-tetraphenylporphyrinate and aluminoxane, under inert atmosphere at room temperature, aromatic solvents. The catalyst precursor was prepared by interaction WCl6 with free tetraphenylporphyrin carbon tetrachloride characterised spectroscopic methods. Physical-chemical studies on between components monomer, as well kinetic results indicated a high stability efficiency system employed. It is interest that polyalkenamers displayed trans stereoconfiguration block or alternate distribution carbon-carbon double bonds dyads. These behaved “living” ones allowed monomodal narrow molecular weight to be produced. Block copolymers starting from dicyclopentadiene conjunction cyclopentene cyclooctene have also obtained. Data recorded above conditions gave information concerning structure active species, nature initiation propagation steps, reaction mechanism stereochemistry.