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Coordination polymerization in water affording amorphous polyethylenes.

A Held1, S Mecking

  • 1Institut für Makromolekulare Chemie und Freiburger Materialforschungszentrum der Albert-Ludwigs-Universität Freiburg, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 24, 2001
PubMed
Summary

Coordination polymerization of ethylene in water yields branched polyethylene at high rates. Catalyst stability is achieved through polymer encapsulation, preventing decomposition in the aqueous medium.

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Area of Science:

  • Polymer Chemistry
  • Catalysis
  • Materials Science

Background:

  • Coordination polymerization typically occurs in organic solvents.
  • Ethylene polymerization in aqueous media presents challenges due to catalyst stability and monomer solubility.
  • Developing environmentally benign polymerization processes is a key research area.

Purpose of the Study:

  • To investigate the coordination polymerization of ethylene in water using a cationic diimine-substituted methyl complex.
  • To understand the factors influencing polymerization rate, catalyst stability, and polymer properties in an aqueous medium.
  • To compare the outcomes of suspension polymerization in water with solution polymerization in an organic solvent.

Main Methods:

  • Utilized a cationic diimine-substituted methyl complex as a catalyst precursor for ethylene polymerization.

Related Experiment Videos

  • Conducted polymerization in water as a suspension medium and in methylene chloride as a solution medium.
  • Analyzed polymer microstructure, thermal properties, and mechanical properties.
  • Investigated mass transfer phenomena and catalyst stability.

    • Main Results:

    • Achieved high polymerization rates (up to 900 turnover frequency) producing rubbery amorphous branched polyethylene.
    • Observed increased polymerization rates with ethylene pressure in water, indicating monomer concentration control at active sites.
    • Demonstrated high catalyst stability in water attributed to encapsulation within the hydrophobic polymer, restricting aqueous phase access.
    • Found that polymer properties differ due to suspension vs. solution phase behavior, not water's effect on active centers.

    Conclusions:

    • Coordination polymerization of ethylene in water is feasible, yielding branched polyethylene with distinct properties.
    • Catalyst stability in aqueous suspension polymerization is enhanced by polymer encapsulation.
    • The phase behavior during polymerization significantly influences polymer microstructure and macroscopic properties.