Improved substrate protection and self-healing of boundary lubrication film consisting of polydimethylsiloxane with cationic side groups

Erik Hsiao, Laura C. Bradley, Seong Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The substrate protection and self-healing capability of a cationic polymer lubricant (CPL) on a silicon oxide surface were tested with a pin-on-disc tribometer and atomic force microscopy (AFM). CPL was made of low molecular weight polydimethylsiloxane (PDMS) containing covalently attached quaternary ammonium cations and iodide counter-anions. CPL was spin-coated on the silicon oxide surface to form a 3-4 nm thick bound-and-mobile lubricant layer. The CPL film capable of binding to the SiO 2 surface through ionic interactions is superior in substrate protection than the neutral PDMS film which cannot form the bound layer. The mobile component in the CPL film readily flows into the lubricant-depleted sliding contact region from the surrounding film. The self-healing capability of CPL via lateral flow is slightly enhanced in humid environments due to water uptake in the film. The 3-4 nm thick CPL film on silicon oxide takes 30-40 s to flow into a ~50 μm wide track, which corresponds to an apparent spreading rate of 2-3 × 10 -11 m 2/s.

Original languageEnglish (US)
Pages (from-to)33-40
Number of pages8
JournalTribology Letters
Volume41
Issue number1
DOIs
StatePublished - Jan 1 2011

Fingerprint

boundary lubrication
healing
Polydimethylsiloxane
lubricants
Lubrication
Lubricants
Polymers
Substrates
polymers
Silicon oxides
silicon oxides
baysilon
sliding contact
tribometers
Iodides
low molecular weights
Ammonium Compounds
iodides
Anions
Cations

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

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abstract = "The substrate protection and self-healing capability of a cationic polymer lubricant (CPL) on a silicon oxide surface were tested with a pin-on-disc tribometer and atomic force microscopy (AFM). CPL was made of low molecular weight polydimethylsiloxane (PDMS) containing covalently attached quaternary ammonium cations and iodide counter-anions. CPL was spin-coated on the silicon oxide surface to form a 3-4 nm thick bound-and-mobile lubricant layer. The CPL film capable of binding to the SiO 2 surface through ionic interactions is superior in substrate protection than the neutral PDMS film which cannot form the bound layer. The mobile component in the CPL film readily flows into the lubricant-depleted sliding contact region from the surrounding film. The self-healing capability of CPL via lateral flow is slightly enhanced in humid environments due to water uptake in the film. The 3-4 nm thick CPL film on silicon oxide takes 30-40 s to flow into a ~50 μm wide track, which corresponds to an apparent spreading rate of 2-3 × 10 -11 m 2/s.",
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Improved substrate protection and self-healing of boundary lubrication film consisting of polydimethylsiloxane with cationic side groups. / Hsiao, Erik; Bradley, Laura C.; Kim, Seong.

In: Tribology Letters, Vol. 41, No. 1, 01.01.2011, p. 33-40.

Research output: Contribution to journalArticle

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