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Modularly prepared segmented fluorinated silicones and their anomalous microstructure dependent flow behavior.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Octafluorocyclopentene is a versatile reagent for synthesizing novel monomers.
  • Eugenol and alkyldiols/bisphenols are suitable starting materials for functional monomer preparation.

Purpose of the Study:

  • To synthesize terminally unsaturated monomers using octafluorocyclopentene.
  • To prepare segmented fluorosilicones via hydrosilylation reactions.
  • To evaluate the properties of novel fluorosilicones for potential lubricant applications.

Main Methods:

  • Regio-controlled addition-elimination reactions between octafluorocyclopentene and eugenol/alkydiols/bisphenols.
  • Platinum-catalyzed hydrosilylation of eugenolic-based monomers with hydride-terminated polydimethylsilane oligomers.
  • Characterization of monomers and polymers using techniques such as molecular weight determination, calorimetry, thermogravimetric analysis, and rheology.

Main Results:

  • High molecular weight, terminally unsaturated monomers were synthesized with high purity and in multi-gram quantities.
  • A versatile pool of segmented fluorosilicones was successfully prepared.
  • The synthesized fluorosilicones exhibit adaptable structure-property relationships.

Conclusions:

  • Octafluorocyclopentene is an effective coupling reagent for monomer synthesis.
  • The developed fluorosilicones are promising candidates for next-generation lubricants, particularly for in-space applications.
  • The tunable properties of these fluorosilicones allow for tailored performance characteristics.