Ethylene-ct-methylstyrene (EMS) copolymers were prepared by anionic polymerization using butyllithium and N,N,N',N'-tetramethylethylenediamine (TMEDA) as an initiator. The 13C n.m.r, spectra of EMS copolymers are observed and assigned mainly using two kinds of n.m.r, techniques: 13C distortionless enhancement by polarization transfer (d.e.p.t.) and the two-dimensional incredible natural abundance double quantum transfer experiment (2D-INADEQUATE). The monomer composition, the sequence distribution in the triad level and the number-average sequence length are determined on the basis of the 13 C n.m.r, results
Посилання на статтю:
13C n.rn.r, sequence analysis of ethylene- - methylstyrene copolymers / Takashi Kanezaki*, Masato Kijima, Kazuo Kume and Kazuo Sato // Polymer. – 1994. – Vol 35. – P. 2523-2527.