摘要
C. J. Carman, Tanaka, G. J. Ray, R. C. Randall and coworkers have made an exhaustive study of copolymers of ethylene and propylene （EP） with 13C-NMR, including the assignments of all the resonances and the determination of monomer sequence distribution. With a view to facilitating the application of our method in 13C-NMR determination in routine analyses, we use the ordinary carbon tetrachloride as solvent and carry out the determinations under ambient temperatures. Although the spectra obtained
