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    Preparation of hydrophilic polymeric nanolayers attached to solid surfaces via photochemical and ATRP techniques

    Year: 2013

    Journal: Journal of Polymer Research, 20, 124, 20130926

    Authors: Khalid A. Ibrahim, Ala’a H. Al-Muhtaseb, Oswald Prucker, Jürgen Rühe

    Organizations: Department of Chemical Engineering, Faculty of Engineering, Al-Hussein Bin Talal University, Ma’an, Jordan, Petroleum and Chemical Engineering Department, Faculty of Engineering, Sultan Qaboos University, Muscat, Oman, Department of Microsystems Engineering (IMTEK), Universityof Freiburg, 79110 Freiburg, Germany

    Three different hydroxyl functional propylene/10-undecen-1-ol (PP-OH) copolymers were attachedphotochemically to a photoreactive benzophenone derivativethat was bound to SiO2 surfaces via a silane anchor. Asa result of the photochemical reaction, thin layers of the PPOHpolymers were covalently bound to the surface. Thethickness of the layers was a function of the molecularweight of the polymer. Poly(2-hydroxyethymethacrylate)(PHEMA) nanolayers were successfully grafted onto thePP-OH-modified silicon wafers (PP-OHMSW) via surfaceinitiatedatom-transfer radical polymerization (ATRP) inaqueous media at ambient temperature. Kinetic studies revealedan increase in thickness with reaction time, indicatingthat the polymerization process has some “living”character. Contact angle measurements showed a reductionin the water contact angles of the resulting PP-OHMSWPHEMAs,indicating a more hydrophilic surface tensionstate. The coupling of ATRP initiator to the hydroxyl groupson the PP-OH polymers, the surface-initiated ATRP, and thegrafting of PHEMA onto the PP-OHMSW were confirmedby Fourier transform infrared spectroscopy (FT-IR). Thegrafted polymeric layers provide a platform for further surfacemodification through the functionalization of the hydroxylgroups of the PHEMA polymers.