Abstract
The monomer unit sequence distribution in partly epoxidized trans-1,4-polyisoprene was determined by the 13C NMR spectrometry available. Epoxidation of polymer was carried out by peracid prepared in situ from hydrogen peroxide and a small amount of formic acid, and the epoxy content in the modified polymer was determined by 1H NMR. The 13C NMR spectra of the partly epoxidized trans-1,4-polyisoprene exhibited new signals both in the olefinic and aliphatic carbon regions, in addition to the signals due to the original trans-1,4-polyisoprene. Each signal, except for the methyl carbon signals, was interpreted in terms of the dyad or triad of trans-1,4 and epoxidized units, taking into consideration the results from the signal assignments made by off-resonance decoupling techniques and lanthanide shift reagent experiments. The monomer unit sequence distribution in partly epoxidized trans-1,4-polyisoprene determined by 13C NMR agreed very closely with that calculated on the basis of the random distribution of trans-1,4 and epoxidized isoprene units. These results suggest that the site of the epoxy group formed is not affected by such groups previously formed in polyisoprene.
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