Journal of Polymer Science Part A: Polymer Chemistry, Vol.42, No.9, 2171-2178, 2004
C-13 NMR determination of the microstructure of polypropylene obtained with the DADNi(NCS)(2)/methylaluminoxane catalyst system
A complete C-13 NMR characterization of a polymer synthesized with a new Ni-diimine complex [DADNi(NCS)(2), where DAD = 2,6-iPr-C6H3-N=C(Me)-C(Me)=N-2,6-iPr-C6H3] activated by methylaluminoxane by homopolymerization of propylene is presented. The amorphous material was made up mainly of blocks of syndiotactic polypropylene and ethylene-propylene copolymer. Some degree of propylene inversion (<1.2 mol %) and of long isobutyl and 2-methyl hexyl branching (<1 mol %) were assigned and quantified. (C) 2004 Wiley Periodicals, Inc.