A series of ethylene/propylene/1‐octene terpolymers with different composition is examined by 13C NMR. Assignments of the various carbon resonances are accomplished by comparison with spectra of ethylene/propylene, ethylene/1‐octene, and propylene/1‐octene copolymers and by INEPT multi‐pulse technique. The polymers obtained with a high‐mileage titanium‐magnesium catalyst contain no inverted propylene sequences. The intensities of all the lines are used in the calculation, and this approach allows the terpolymer composition and the sequence distribution to be determined.
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Hongwei et al. (1988) studied this question.
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