Surface functionalization of thermoplastic polymers for the fabrication of microfluidic devices by photoinitiated grafting

Thomas Rohr*, D. Frank Ogletree, Frantisek Svec, Jean Frechet

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

176 Scopus citations

Abstract

Photografting has been used for the surface modification of a wide range of commercial commodity polymers such as polystyrene, 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 abstraction 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.

Original languageEnglish (US)
Pages (from-to)264-270
Number of pages7
JournalAdvanced Functional Materials
Volume13
Issue number4
DOIs
StatePublished - Apr 1 2003

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry

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