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Water absorption in polyethylene under external electric fields.

E Johansson1, K Bolton, P Ahlström

  • 1School of Engineering, University College of Borås, SE-501 90 Borås, Sweden.

The Journal of Chemical Physics
|July 21, 2007
PubMed
Summary
This summary is machine-generated.

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High electric fields decrease water solubility in polyethylene, favoring the water phase. However, typical high voltage fields do not significantly alter solubility, though they do affect water cluster structure and alignment.

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Polymer Science

Background:

  • Understanding water's behavior within polymer matrices is crucial for material performance, especially in electrical applications.
  • External electric fields can influence molecular interactions and phase behavior within composite materials.

Purpose of the Study:

  • To investigate the impact of external electric fields on the solubility and structural organization of water within polyethylene.
  • To determine the threshold field strength at which water solubility and clustering are significantly affected.

Main Methods:

  • Monte Carlo simulations were employed to model water in polyethylene under varying electric field strengths (2 x 10^5 to 4 x 10^9 V/m).
  • Simulations considered systems in thermodynamic equilibrium with liquid water at specified temperatures and pressures.

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Main Results:

  • Water solubility in polyethylene decreases significantly at higher electric fields due to energetic favorability of the pure water phase.
  • Fields relevant to high voltage conduction (excluding defect sites) showed no substantial change in water solubility.
  • Increased electric fields led to a reduction in water cluster numbers, with larger clusters diminishing more rapidly, and an increased fraction of water monomers.

Conclusions:

  • High electric fields alter water's solubility and structural arrangement in polyethylene, promoting monomeric water and linear cluster topologies.
  • The observed effects are field-dependent, with practical high voltage fields having a limited impact on solubility but influencing molecular organization.