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T. Rohr, F.D. Ogletree, F. Svec, J.M.J. Frechet:
"Surface functionalization of thermoplastic polymers for the fabrication of microfluidic devices by photoinitiated grafting";
Advanced Functional Materials, 13 (2003), S. 264 - 270.

Photografting has been used for the surface modification of a wide range of com. commodity rs such as polystyrene, poly(Me methacrylate), poly(di-Me 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 abstraction of a hydrogen atom from the surface of channels within the materials, their permeability for UV light was tested and polyolefines were found to be best candidates. A no. of monomerse with a variety of functional groups such as perfluorinated, hydrophobic, reactve, acidic, basic, and zwitterionic have been successfully grafted from the surface of selected substrates, and the grafting efficiency detd. using X-ray photoemission spectroscopy. Layered surface structures were prepd. by consecutive grafting of different monomers. Our approach also enables photolithog. patterning of surfaces and specific functionalization of confines areas within the microchannel.

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