F. P. Alt, W. Heitz
Sep 1, 1998
Citations
0
Influential Citations
42
Citations
Journal
Acta Polymerica
Abstract
The polymerization of bicyclo[2.2.1]hept-2-ene (norbornene) with the catalysts bis(benzoylacetonato)cobalt(II and bis(trifluoroacetylacetonato)cobalt(II) activated with methylalumoxane in toluene (MAO) or in chlorobenzene (MAO * ) in the presence of ethene was investigated. MAO * results in catalysts with much higher activity than with MAO. The reaction results in low molecular weight poly(2,3-bicyclo[2.2.1]hept-2-ene) macromonomers terminated with a vinylic end group due to β-hydride elimination after insertion of an ethene monomer unit. No copolymers were formed. The molecular weight (M n = 1 100-6000 g/mol) and the glass transition temperature (T g = 75-260 C) of the macromonomers depend on the ethene pressure.