Polymer Bulletin

, Volume 21, Issue 1, pp 5–12 | Cite as

Electron donors in carbocationic polymerization

IV. Preparation of narrow-dispersitytert.-chlorine-capped polyisobutylene by thetrans-2,5-diacetoxy-2,5-dimethyl-3-hexene/BCl3/dimethyl sulfoxide system
  • Miklos Zsuga
  • J. P. Kennedy
Article
Accepted:

Summary

Low molecular weight (¯Mn ∼900–5000) narrow molecular weight distribution (MWD; ¯Mw/Mn = 1.1–1.2)tert.-chlorine telechelic polyisobutylenes (PIBs) have been synthesized by the use of thetrans-2,5-dimethyl-2,5-diacetoxy-3-hexene (DiOAcDMeH6)/BCl3 initiating system in the presence of the electron donor (ED) dimethyl sulfoxide (DMSO) in methyl chloride diluent at −30°C. The living character of the polymerization was demonstrated by linear Mn versus Wp (weight of polymer) plots starting at the origin with the slope of 1/[Io] (where [Io] = initiator concentration). DMSO reduces the overall rate of polymerization, however, it increases the initiator efficiency (Ieff) to ∼100%. The number averagetert.-chlorine end functionality is -Fn=1.97±0.04, by1H NMR spectroscopy. Polymerization mechanistic details are discussed. This is the first time narrow MWDtert.-chlorine telechelic PIB has been prepared close to the reflux temperature of methyl chloride.

Keywords

DMSO Chlorine Sulfoxide Dimethyl Sulfoxide Electron Donor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Miklos Zsuga
    • 1
  • J. P. Kennedy
    • 1
  1. 1.Institute of Polymer ScienceUniversity of AkronAkronUSA

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