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Pressure-induced polymerization in solid ethylene.

David Chelazzi1, Matteo Ceppatelli, Mario Santoro

  • 1LENS, European Laboratory for Non-Linear Spectroscopy and INFM, Via N. Carrara 1, I-50019, Sesto Fiorentino (FI), Italy.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
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High pressure transforms ethylene into polyethylene. Different pressures yield distinct polymer types: crystalline high-density polyethylene at 3.6 GPa and branched low-density polyethylene at 5.4 GPa.

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • High-Pressure Physics

Background:

  • Ethylene is a fundamental organic molecule and the precursor to polyethylene, a widely produced polymer.
  • Understanding polymerization under extreme conditions is crucial for novel material synthesis.

Purpose of the Study:

  • To investigate the polymerization of ethylene under high pressure at room temperature.
  • To characterize the resulting polyethylene structures and reaction kinetics.

Main Methods:

  • High-pressure infrared spectroscopy was employed to study ethylene.
  • Compression of crystalline phase I ethylene above 3.0 GPa induced polymerization.
  • Reaction kinetics were analyzed at 3.6 GPa and 5.4 GPa.

Main Results:

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  • Polymerization of ethylene was observed above 3.0 GPa.
  • High-density crystalline polyethylene was recovered at 3.6 GPa.
  • Low-density, branched, and conformationally disordered polyethylene formed at 5.4 GPa.

Conclusions:

  • High pressure is a viable route for ethylene polymerization.
  • Pressure-dependent control over polyethylene density and structure is achievable.
  • A reaction mechanism was proposed based on kinetic and structural data.