Carbon-13 NMR Chemical Shift Assignments of Comonomer Sequences in a 1-Butene-Propylene Copolymer

  • Aoki A
  • Hayashi T
  • Asakura T
  • 4


    Mendeley users who have this article in their library.
  • 18


    Citations of this article.


13C NMR chemical shift assignments of comonomer sequences in a 1-butene-propylene copolymer were obtained from the 13C two-dimensional INADEQUATE NMR experiment and from the calculated chemical shifts due to the y effect. By tracing carbon-carbon connectivities in the 2D- INADEQUATE spectrum, the validity of previous assignments of triad and tetrad sequences was confirmed. Referring to the confirmed assignments, the chemical shift differences among comonomer sequences longer than pentad were predicted by the chemical shift calculation (the y-effect method) based on the y effect of the 13C chemical shift and Mark's rotational isomeric state model modified by considering the side-chain conformation in a 1-butene unit. Assignments provided in this study agree well with Cheng's assignments by a reaction probability model. Further, the conformational probability of the side chain in a 1-butene unit was evaluated through the chemical shift calculation.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text


  • Akira Aoki

  • Tetsuo Hayashi

  • Tetsuo Asakura

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free