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The chain microstructure, crystallization and morphology of three olefinic blocky copolymers (OBCs)1 were compared.Analysis of the 13C NMR spectra with two-site first-order Markovian model2 reveals that two samples (OBC-A and OBC-C) have similar overall octene contents and weight percentages of the hard block, but OBC-B has a higher overall octene content and a lower weight percentage of the hard block.