Abstract
AbstractA detailed microstructural characterization of ethylene‐propene copolymers, obtained with a high yield Ti‐catalyst and showing elastomeric properties, was carried out by 13C NMR spectroscopy. These copolymers show no inversions in propene insertion, a tendency to form blocks of ethylene and propylene, and the presence of both isotactic and atactic blocks of propylene. Furthermore, in these polymers the reactivity ratio product (r1 · r2) and the experimental versus calculated triad distribution point to the presence of components which are heterogeneous with respect to the monomer distribution and composition. 13C NMR analysis of fractions, separated by hexane and ether, supports the above hypothesis.
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