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Microscopy of Polyurea Grease.

Matthew A Thorseth1, Joseph D Harris1, Junsi Gu2

  • 1The Dow Chemical Company Analytical Sciences, 1897 Building, 633 Washington St, Midland, MI48640, USA.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|December 23, 2020
PubMed
Summary

This study reveals new entangled fiber and nanotube structures in polyurea greases, observed without oil removal. These microstructures correlate with grease stiffness, offering insights into lubricant performance.

Keywords:
TEMcryo-SEMgreasenanotubespolyureatomographyultramicrotomy

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Area of Science:

  • Tribology and Materials Science
  • Lubricant Chemistry and Engineering

Background:

  • Understanding grease physical structure is key to enhancing lubricating performance.
  • Observing grease microstructure is challenging, especially for polyurea greases.
  • Previous methods often involved oil removal, altering the polyurea structure.

Purpose of the Study:

  • To investigate the impact of sample preparation on polyurea grease microstructure.
  • To identify novel structural features in polyurea greases.
  • To correlate microstructure with grease mechanical properties like stiffness.

Main Methods:

  • Examining polyurea grease microstructure under varied sample preparation conditions.
  • Utilizing advanced microscopy techniques to visualize nanoscale structures.
  • Quantifying microstructure coverage and measuring grease stiffness.

Main Results:

  • Discovery of previously unobserved polyurea microstructures, including entangled fibers and nanotubes.
  • Demonstration that sample preparation significantly affects observed microstructure.
  • Establishment of a correlation between microstructure coverage and grease stiffness.

Conclusions:

  • Novel polyurea microstructures can be observed without oil phase removal.
  • Sample preparation is a critical factor in polyurea grease microstructure analysis.
  • The observed microstructure directly influences grease stiffness and potentially lubricating performance.