NUCLEAR-MAGNETIC-RESONANCE EVIDENCE FOR A NEW MICROSTRUCTURE IN ETHENE-CYCLOPENTENE COPOLYMERS

We have analyzed the microstructure of a series of copolymers of ethen e and cyclopentene prepared with a novel ferrocene-substituted catalys t using one- and two-dimensional C-13- and H-1-NMR methods. Up to 64% of the cyclopentene is incorporated as 1,3-cyclopentylene units, which has not been observed previously in copolymers. The subspectra were d erived based on a triad model. The polymers appeared to be atactic wit h mainly cis-incorporated cyclopentylene units. No ring opening could be detected.