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Reversible polymerization driven by folding.

Dahui Zhao1, Jeffrey S Moore

  • 1Department of Chemistry, University of Illinois, Urbana 61801, USA.

Journal of the American Chemical Society
|August 22, 2002
PubMed
Summary
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High-molecular weight polymers were formed from m-phenylene ethynylene imine oligomers. Polymerization is driven by chain folding, correlating with helical stability and showing responsiveness to solvent and temperature.

Area of Science:

  • Polymer Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Bisfunctionalized m-phenylene ethynylene imine oligomers are precursors for novel polymers.
  • Polymerization via reversible imine bond metathesis is a developing area.
  • Oligomer chain folding is a potential driving force in polymerization.

Purpose of the Study:

  • To synthesize high-molecular weight poly(m-phenylene ethynylene imine)s.
  • To investigate the role of oligomer folding stability in polymerization.
  • To explore the reversibility and responsiveness of the polymerization process.

Main Methods:

  • Polymerization of bisfunctionalized m-phenylene ethynylene imine oligomers in acetonitrile.
  • Varying solvent polarity to alter oligomer folding stability.

Related Experiment Videos

  • Correlating resulting polymer molecular weight with oligomer helical stability.

    • Main Results:

    • High-molecular weight poly(m-phenylene ethynylene imine)s were successfully synthesized.
    • A direct correlation was found between oligomer helical stability and polymer molecular weight.
    • The polymerization process was confirmed to be reversible and sensitive to solvent and temperature.

    Conclusions:

    • Oligomer chain folding is a key factor driving the polymerization of m-phenylene ethynylene imine oligomers.
    • The molecular weight of the resulting polymers can be controlled by tuning oligomer folding stability.
    • These polymers exhibit dynamic behavior, responding to environmental changes.