¹³C NMR determination of the microstructure of polypropylene obtained with the DADNi(NCS)₂/methylaluminoxane catalyst system

Abstract

A complete 13C 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. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2171–2178, 2004

A study of the effect of styrene concentration on the molecular weight of polypropylene produced using metallocene catalysts

“…The tacticity and comonomer content of the homopolymers and copolymers were determined using 1 H NMR and 13 C NMR spectroscopy with a Varian Innova 300 spectrometer operating at Lamor frequencies of 300 and 75 MHz, respectively 18. 1,1,2,2‐Tetrachloroethane‐ d 2 was used as the solvent and the samples were run at 120 °C.…”

Synthesis of Polypropylene via Catalytic Deoxygenation of Poly(methyl acrylate)

“…On the other hand, no change was observed from the peaks corresponding to PS. Based on the assignment given in the literature, we determined that atactic PP with <7% of defects, such as ethylene (E) and propylene repeating units with the head-to-head configuration (P*), was obtained (Figure S9). We mainly attribute the ethylene defects to the alkyl shift during the reaction, as we observed from the model reaction study (Figure S2).…”