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    Aqueous lubrication of poly(etheretherketone) via surface-initiated polymerization of electrolyte monomers

    Year: 2017

    Journal: Polymer, Volume 116, MAY 5, page 549–555

    Authors: Chouwatat, Patcharida; Hirai, Tomoyasu; Higaki, Keiko; Higaki, Yuji; Sue, Hung-Jue; Takahara, Atsushi

    Organizations: ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan); MEXT Project of "Integrated Research Consortium on Chemical Sciences"

    Keywords: PEEK; Polyelectrolyte brushes; Friction; Water lubrication

    Poly(etheretherketone) (PEEK) substrate surface was modified with charged cationic poly(2-(methacryloyloxy) ethyltrimethylammonium chloride) (PMTAC) and anionic poly(3-sulfopropyl methacrylate potassium salt) (PSPMK) polymer brushes through surface-initiated radical polymerization triggered by UV light exposure of benzophenone groups in PEEK backbone as an initiator. After extensive UV light exposure, the PEEK surface was covered with grafted polyelectrolyte chains and exhibited swollen polyelectrolyte brushes with high roughness under water, indicating high graft density and wide molecular weight distributions of PMTAC and PSPMK brushes. The hydrated polyelectrolyte brushes on PEEK surface induce significant air bubble repellency in water. Thus, thickening of swollen polyelectrolyte brushes dramatically reduces the friction coefficient of PEEK surface under a wet condition. (C) 2017 Elsevier Ltd. All rights reserved.
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