Abstract
Covalent crosslinking of weak polyelectrolyte brushes widens the tuning potential for their swelling, nanomechanical, and nanotribological properties, which can be simultaneously adjusted by varying the crosslinker content and the pH of the surroundings. We demonstrate that this is especially valid for poly(hydroxyethyl methacrylate) (PHEMA) brushes and brush hydrogels, and their ionizable, succinate-modified derivatives (PHEMA-SA), covalently crosslinked with different amounts of di(ethylene glycol) dimethacrylate (DEGDMA) during surface-initiated atom transfer radical polymerization (SI-ATRP). Atomic force microscopy (AFM) methods highlight how pristine PHEMA films are stiff and display high coefficients of friction in water. Their succinate derivatives swell profusely in aqueous media. Under acidic conditions they are neutral, compliant, and lubricious, with apparent Young’s moduli (E*) lying between 10 and 30 kPa. Their contact mechanical behavior can be described by either the Johnson–Kendall–Roberts...
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