Synthesis, Characterization, and Aqueous Lubricating Properties of Amphiphilic Graft Copolymers Comprising 2-Methoxyethyl Acrylate

Irakli Javakhishvili, Troels Røn, Katja Jankova Atanasova, Søren Hvilsted, Seunghwan Lee

Research output: Contribution to journalJournal articlepeer-review

Abstract

Amphiphilic anionic and cationic graft copolymers possessing poly(2-hydroxyethyl methacrylate) (PHEMA) backbone and poly(methacrylic acid), poly(2-methoxyethyl acrylate-co-methacrylic acid), and poly(2-methoxyethyl acrylate-co-2-(dimethylamino)ethyl methacrylate) grafts are constructed by merging reversible addition–fragmentation chain transfer (RAFT) polymerization, copper-mediated atom transfer radical polymerization (ATRP), and a selective deprotection reaction. Initially, multifunctional ATRP macroinitiators based on PHEMA backbone are prepared by RAFT polymerization. Then ATRP of the corresponding monomers followed by deblocking reaction leads to well-defined amphiphiles with narrow molecular weight distributions (PDI ≤ 1.29) and varying content of methacrylic acid. The graft copolymers showed effective surface adsorption and lubrication for self-mated poly(dimethylsiloxane) (PDMS) contacts in physiological salt concentration. This is indebted from “dilution” of the charges along the grafted chains by balancing neutral/charged repeating units to minimize the accumulated charge repulsion on neutral surface. Improved lubricating properties of the graft copolymers compared to the block copolymer counterparts further support superior stability of graft copolymers on surfaces.
Original languageEnglish
JournalMacromolecules
Volume47
Issue number6
Pages (from-to)2019-2029
ISSN0024-9297
DOIs
Publication statusPublished - 2014

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