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30 June 2000 UV free-radical polymerization for micropatterning poly(ethylene glycol)-containing films
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We have developed novel techniques for the preparation of micropatterned structures from thin films prepared by the block copolymerization of monomers using UV free-radial polymerizations. The process involves polymerizing the first monomer layer in the presence of an iniferter (initator-transfer agent-terminator) with a dithiocarbamate group to make a photosensitive polymer. Upon application of the second monomer layer on the first polymer layer and irradiation, a copolymer is formed between the two layers. Patterns are created on the films by applying a mask and selectively irradiating the surface. We have successfully polymerized poy (ethylene glycol) (PEG) onto a highly crosslinked material of poly(ethylene glycol) dimethacrylate. Various patterns have been created to determine the precision that can be achieved with this method. Preliminary results show that the patterns in the second monomer layer can be from 5 micrometers to 100 micrometers thick, with feature size as small as 5 micrometers , allowing the use of this material to high aspect ratio structures for micro-fluidics. In addition, applications of this type of material are also in bioMEMS, biomaterials, and biosensors for the selective adhesion of cells and proteins.
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Jennifer H. Ward, Rafael Gomez, Rashid Bashir, and Nicholas A. Peppas "UV free-radical polymerization for micropatterning poly(ethylene glycol)-containing films", Proc. SPIE 4097, Complex Mediums, (30 June 2000);

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