Investigation of ethylene/1‐octene copolymerization models by carbon‐13 NMR

摘要

AbstractStatistical reaction models have been used to fit C‐NMR spectra for ethylene/1‐octene copolymers and to describe the polymerization reaction probabilities. Ten models ranging in complexity from a one‐site Bernoulli probability to multiple site second‐order Markov systems were studied. Model parameters were determined by fitting the experimental integrations of replicated spectra using a maximum likelihood method. The best fit to the experimental NMR spectra was obtained with a two‐site model, one site producing mainly high‐density polymer following a Bernoulli probability model, while the second site allows more incorporation of octene following a chain‐end controlled probability described by first‐order Markov statistics. © 1994 John