Chinese Journal of Polymer Science

, Volume 29, Issue 3, pp 360–367

Synthesis of highly reactive polyisobutylenes with BF3·cyclohexanol initiating system

  • Lai-bao Zhang
  • Yi-xian Wu (吴一弦)
  • Peng Zhou
  • Guan-ying Wu
  • Wan-tai Yang
  • Ding-sheng Yu
Papers

Abstract

The selective cationic polymerization of isobutylene (IB) initiated by a BF3·cyclohexanol (CL) complex was carried out from the mixed C4 fraction feed containing the 4C saturated and unsaturated hydrocarbons at −20°C. The effects of CL concentration, BF3 concentration, solvent for preparing BF3·CL complex and polymerization time on the chemical structure of end groups, number-average molecular weight (Mn) and molecular weight distribution (MWD, Mw/Mn) of the resulting polymers were investigated. The experimental results indicate that the BF3·CL complex initiating system exhibited an extremely high selectivity toward the cationic polymerization of IB in the mixed C4 fraction feed and low molecular weight (Mn = 900–3600) polyisobutylenes (PIBs) with large proportion of exo-double bond end groups were obtained. The exo-double bond content in PIB chain ends increased by increasing CL concentration or by decreasing solvent polarity in initiating system, BF3 concentration and polymerization time. The Mn and MWD of the resulting PIBs were dependent on the concentrations of CL and BF3. Highly reactive PIBs with around 90 mol% of exo-double bonds were successfully synthesized by the selective polymerization of IB from the mixed C4 fraction feed, providing a potentially practical process for its simplicity and low costs.

Keywords

Reactivity Polyisobutylene Initiator Cationic polymerization 

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Copyright information

© Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Lai-bao Zhang
    • 1
  • Yi-xian Wu (吴一弦)
    • 1
  • Peng Zhou
    • 1
  • Guan-ying Wu
    • 1
  • Wan-tai Yang
    • 1
  • Ding-sheng Yu
    • 1
  1. 1.State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers (Ministry of Education)Beijing University of Chemical TechnologyBeijingChina

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