The fraction soluble in boiling heptane of a mixture of polypropylene, polyethylene and ethylene-propylene copolymer was characterized by 13C nuclear magnetic resonance (n.m.r.) combined with temperature-rising elution fractionation. Two mathematical models were used to achieve quantitative analysis of the fractions from n.m.r, triad data. The result indicates that the ethylene-propylene copolymer made with an MgC12/TiCl4-supported catalyst contains two or three major components and that the polypropylene exhibits high compositional heterogeneity. Simulation of the 13C n.m.r, spectrum was successfully used to confirm the results.
Посилання на статтю:
Quantitative analysis of mixtures of ethylene- and propylene-based polymers by temperature-rising elution fractionation and 13C nuclear magnetic resonance / Lionel Gilet and Marie-Florence Grenier-Loustalot // Polymer. – 1992. – Vol 33. – P. 4605-4610.