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Fluorination of Polymethylmethacrylate (PMMA) Film and Its Surface Characterization  

Jung, Min-Jung (Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University)
Lim, Jae-Won (Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University)
Park, In-Jun (Research Center for Biorefinery, Korea Research Institute of Chemical Technology)
Lee, Young-Seak (Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University)
Publication Information
Applied Chemistry for Engineering / v.21, no.3, 2010 , pp. 317-322 More about this Journal
Abstract
In this study, poly(methyl methacrylate) (PMMA) was treated with changing mixing ratios of $F_2$ and $O_2$ using oxyfluorination method for hydrophilic modification of PMMA film. For the characterizations of oxyfluorinated PMMA surface, contact angle, surface free energy, X-ray photoelectron spectroscopy (XPS) and optical transmittance (UV-vis) were carried out. After the oxyfluorination, PMMA surface became more hydrophilic showing the decrease of water contact angle from $69^{\circ}$ to $44^{\circ}$. So, surface free energy of oxyfluorinated PMMA film was increased from 46 to $58\;mN\;m^{-1}$. These results are attributed to hydrophilic functional groups such as hydroxyl group formed oxyfluorination method on the PMMA surface. From XPS results, it was confirmed that O/C concentration ratio on the surface of PMMA was increased, the amount of C-OH bonding which shows hydrophilicity was also largely increased from 6.7 to 24.8% with increasing fluorine partial-pressure via the oxyfluorination, The oxyfluorination conditions, room temperature, 1 bar with one mixture ratio of $F_2$ to $O_2$ had little influence on optical transmittance properties of PMMA film but enhanced its surface hydrophilicity. This result suggests that oxyfluorination method could be useful to change hydrophobic PMMA surface to hydrophilic.
Keywords
polymethylmethacrylate; oxyfluorination; hydrophilic surface; surface free energy; optical transmission;
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