Photografting and the control of surface chemistry in three-dimensional porous polymer monoliths

Thomas Rohr, Emily F. Hilder, John J. Donovan, Frantisek Svec, Jean M.J. Fréchet*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

231 Scopus citations

Abstract

The photografting of porous three-dimensional materials has been achieved using a benzophenone-initiated surface photopolymerization within the pores of a macroporous polymer monolith contained in a fused silica capillary. Despite the relatively high thickness (100 μm or more) of the layer of material involved, the photografting process occurs efficiently throughout its cross section as confirmed by electron probe microanalysis. In addition, the use of photomasks during grafting enables the precise placement of specific functionalities in selected and predetermined areas of a single monolith for use in a variety of applications ranging from supported catalysis to microfluidics. For example, we have demonstrated the fast and selective incorporation of chains of poly(2-acrylamido-2-methyl-1-propanesulfonic acid) into the irradiated areas of pores of a 100 μm thick monolith and monitored the extent of grafting through measurements of the electroosmotic flow afforded by the newly introduced ionized functionalities. Grafting of the porous polymer with 4,4-dimethyl-2-vinylazlactone was also successful and could be monitored visually by fluorescence measurements following fluorescent labeling of the grafted chains with Rhodamine 6G.

Original languageEnglish (US)
Pages (from-to)1677-1684
Number of pages8
JournalMacromolecules
Volume36
Issue number5
DOIs
StatePublished - Mar 11 2003
Externally publishedYes

ASJC Scopus subject areas

  • Materials Chemistry

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