Enhancing the grafting of poly(2-hydroxyethyl methacrylate) on silica nanoparticles (SiO2-g-PHEMA) by the sequential UV-induced graft polymerization with a multiple-UV irradiation |
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| Affiliation: | 1. Applied Chemistry Division, Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;2. Office of Central Research Facility, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;3. Materials Chemistry Research Unit, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand |
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| Abstract: | Grafting of poly(2-hydroxyethyl methacrylate) on silica nanoparticles was accomplished via the sequential UV-induced graft polymerization. Under UV-irradiation, the silica was functionalized with the surface initiator, benzophenone (BP) and subsequently graft-polymerized with 2-hydroxyethyl methacrylate (HEMA). The grafting on the silica particles was confirmed by DSC analysis which revealed a shift of the glass transition temperature (Tg) of grafted PHEMA to higher temperature than Tg of ungrafted PHEMA. A significant improvement in the grafting efficiency and the grafting percentage was achieved when a sequential grafting approach was taken, employing multiple UV exposures. Using this approach, the efficient chain extension from the grafted-PHEMA was possible without producing significant amounts of ungrafted PHEMA when low HEMA concentrations were used during each UV-exposure. |
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| Keywords: | Surface modification Grafting UV-induced polymerization Silica nanoparticles Poly(2-hydroxyethyl methacrylate) |
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