Abstract
A highly efficient initiator of olefin polymerization with a previously unavailable combination of desirable properties—high activity; toleration of other functional groups; and stability to heat, air, and moisture—has been developed by chemists at California Institute of Technology [ Angew. Chem. Int. Ed. , 39 , 2903(2000)]. The initiator mediates ring-opening metathesis polymerization (ROMP) of olefins. The initiator opens a cyclic olefin monomer ring, leaving a reactive end. The reactive end attaches to and opens a second monomer ring to propagate the chain. ROMP is already used in industry, most notably in the polymerization of dicyclopentadiene to form polydicyclopentadiene, which is used to fabricate very large vehicle and equipment housings. Only one of the two carbon-carbon double bonds of dicyclopentadiene reacts via ROMP, leaving the other double bond available for cross-linking the resin. Current initiators are sensitive to heat, air, and moisture—limitations that this Caltech initiator overcom...
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