NMR study on the chain structure of cyclized CIS -1,4 - polybutadiene

Zinan Zhou, Jihua Yang, Jianguo Zhang, Yanwen Xiao, Shufen Pang, Xueqin Wang

Research output: Contribution to journalArticlepeer-review

Abstract

It is proved clearly by using H-H COSY that there is the three-substituted bond in the end of polycyclic sequences of cyclized cis-1, 4 polybutadiene. On the other hand, a little of trans -1,4 and 1,2-units of polybutadiene are comprised in the residue linear chain of cyclized cis-1,4 polybutadiene as shown in its 13C NMR spectrum. Based on information provided by H - H COSY, assignment of the high-resolution 1H NMR spectrum of cyclized cis -1, 4 polybutadiene is obtained finally. In order to get the degree of cyclization (X) and the cyclicity (Y) of cyclized cis -1,4 polybutadiene two parameters P and Q are defined. In the same time, the relationship between X, Y and P, Q are discussed and the formulas calculated X and Y are provided. The method proposed in this paper is satisfactory to investigation of its microstructure and physical, physical-chemical properties.

Original languageEnglish (US)
Pages (from-to)569-570
Number of pages2
JournalActa Polymerica Sinica
Issue number5
StatePublished - Dec 1 1996

Keywords

  • Cyclicity
  • Cyclized cis -1,4 polybutadiene
  • NMR
  • The degree of cyclization

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