Polymerization of ethene catalyzed by dicyclopentadienylzirconium dichloride/methylaluminoxane was performed in toluene at 50°C under 0.38–8.95 bar ethene. Both Fourier‐transform infrared spectroscopy and gel‐permeation chromatography showed that the molecular weight is independent of the ethene pressure (concentration). The trans‐vinylene unsaturation content increased as the pressure decreased. Termination by β‐H transfer to a coordinated monomer and a kinetically controlled isomerization reaction are suggested, in order to explain the observations.
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Thorshaug et al. (1997) studied this question.
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