Surface Functionalization of Thermoplastic Polymers for the Fabrication of Microfluidic Devices by Photoinitiated Grafting

Photografting has been used for the surface modification of a wide range of commercial commodity polymers such as poly‐ styrene, poly(methyl methacrylate), poly(dimethyl siloxane), polycarbonate, Parylene C, polypropylene, cyclic olefin copolymer, and hydrogenated polystyrene that are useful substra...

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Published inAdvanced functional materials Vol. 13; no. 4; pp. 264 - 270
Main Authors Rohr, T., Ogletree, D.F., Svec, F., Fréchet, J.M.J.
Format Journal Article
LanguageEnglish
Published Weinheim WILEY-VCH Verlag 01.04.2003
WILEY‐VCH Verlag
Subjects
Grafting
Grafting, photoinitiated
Microfluidic systems
photoinitiated
Polymers
Polymers, thermoplastic
Surface functionalization
thermoplastic
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Summary:Photografting has been used for the surface modification of a wide range of commercial commodity polymers such as poly‐ styrene, poly(methyl methacrylate), poly(dimethyl siloxane), polycarbonate, Parylene C, polypropylene, cyclic olefin copolymer, and hydrogenated polystyrene that are useful substrate materials for the fabrication of microfluidic chips. Since the chain propagation is initiated after UV light‐activated ion of a hydrogen atom from the surface of channels within the materials, their permeability for UV light was tested and polyolefins were found to be the best candidates. A number of monomers with a variety of functional groups such as perfluorinated, hydrophobic, hydrophilic, reactive, acidic, basic, and zwitterionic have been successfully grafted from the surface of selected substrates, and the grafting efficiency determined using X‐ray photoemission spectroscopy. Layered surface structures were prepared by consecutive grafting of different monomers. Our approach also enables photolithographic patterning of surfaces and specific functionalization of confined areas within the microchannel. UV light‐activated photografting has been used for the surface modification of a wide range of commercial commodity polymers that are useful substrate materials for the fabrication of microfluidic chips. A number of monomers with a variety of functional groups such as perfluorinated, hydrophobic, hydrophilic, reactive, acidic, basic, and zwitterionic have been successfully grafted from the surface of selected substrates.
Bibliography:istex:9596F035A5FD0FDC320B48B2381CA776DAF476BA
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ArticleID:ADFM#200304229
This work was supported by the Office of Nonproliferation Research and Engineering of the U.S. Department of Energy under contract No. DE-AC03-76SF00098 as part of a close collaboration with Sandia National Laboratory in Livermore, and, in part, by the National Institute of General Medical Sciences, National Institutes of Health (GM-48364). Support of T. R. by the Austrian Science Fund is gratefully acknowledged. We also thank Dr. Craig R. Tewell for his help in the determination of the UV-emission spectrum, Senol Mutlu for depositing Parylene C on chips, as well as Ticona and Bayer AG for samples of their polymers.
This work was supported by the Office of Nonproliferation Research and Engineering of the U.S. Department of Energy under contract No. DE‐AC03‐76SF00098 as part of a close collaboration with Sandia National Laboratory in Livermore, and, in part, by the National Institute of General Medical Sciences, National Institutes of Health (GM‐48364). Support of T. R. by the Austrian Science Fund is gratefully acknowledged. We also thank Dr. Craig R. Tewell for his help in the determination of the UV‐emission spectrum, Senol Mutlu for depositing Parylene C on chips, as well as Ticona and Bayer AG for samples of their polymers.
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ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.200304229