Aqueous lubricating properties of charged (ABC) and neutral (ABA) triblock copolymer chains

Troels Røn, Irakli Javakhishvili, Navin J. Patil, Katja Jankova Atanasova, Bruno Zappone, Søren Hvilsted, Seunghwan Lee

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Application of charged polymer chains as additives for lubricating neutral surfaces in aqueous envi- ronment, especially via polymer physisorption, is generally impeded by the electrostatic repulsion be- tween adjacent polymers on the surface. In this study, we have investigated the adsorption and aqueous lubricating properties of an amphiphilic triblock copolymer, comprised of a neutral poly(ethylene glycol) (PEG) block, a hydrophobic poly(2-methoxyethyl acrylate) (PMEA) block, and a charged poly(methacrylic acid) (PMAA) block, namely PEG- b -PMEA- b -PMAA. After adsorption onto a nonpolar hydrophobic sur- face from aqueous solution, an equal and homogeneous mixture of neutral PEG and charged PMAA chains is formed on the surface, with an adsorbed polymer mass comparable to its fully neutral coun- terpart, PEG- b -PMEA- b -PEG. The lubricity of PEG- b -PMEA- b -PMAA showed signi fi cant improvement compared to fully charged polymer chains, e.g. poly(acrylic acid)- block -poly(2-methoxyethyl acrylate) (PAA- b -PMEA), which is attributed to dilution of charged moieties on the surface and subsequent improvement of the lubricating fi lm stability
Original languageEnglish
JournalPolymer
Volume55
Pages (from-to)4873-4883
ISSN0032-3861
DOIs
Publication statusPublished - 2014

Keywords

  • Lubrication
  • Triblock copolymer
  • Amphiphilic

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