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Characterization of propylene‐ethylene block copolymers using solid state 13 C‐NMR spectroscopy

1992; Wiley; Volume: 30; Issue: 9 Linguagem: Inglês

10.1002/pola.1992.080300929

1099-0518

Jagdish Prasad,

Advanced MRI Techniques and Applications

Abstract Commercial block copolymers of propylene with ethylene (PEBC) are multiphase systems comprising block and random copolymers as well as small amounts of homopolymers. At present, no satisfactory method exists for characterizing the “blocky” structure of these copolymers. This article aims to fulfill this need. Accordingly, the block and random copolymers of propylene with ethylene have been investigated using 13 C CP/MAS NMR with high‐power dipolar decoupling. Comparisons have been made between the spectra of block and random copolymers and it is shown possible to distinguish between them by means of an additional signal, appearing at 32.5δ, in block copolymers (attributable to block junctions). © 1992 John Wiley & Sons, Inc.