[Zurück]

J. Spanring, C. Buchgraber, M. Ebel, R. Svagera, W. Kern:
"UV Assisted Surface Modification of Polystrene in the Presence of Trialkylsilanes";
Macromolecular Chemistry and Physics, 206 (2005), S. 2248 - 2256.

UV Assisted Surface Modification of Polystyrene in the Presence of Trialkylsilanes

Julia Spanring 1, Christian Buchgraber 2, Maria F. Ebel 3, R. Svagera 3, Wolfgang Kern 1 *
1 Institute for Chemistry and Technology of Organic Materials, Graz University of Technology, A-8010 Graz, Austria
2 Polymer Competence Center Leoben GmbH, A-8700 Leoben, Austria
3 Institute of Solid State Physics, Vienna University of Technology, A-1040 Wien, Austria
email: Wolfgang Kern (w.kern@tugraz.at)

*Correspondence to Wolfgang Kern, Institute for Chemistry and Technology of Organic Materials, Graz University of Technology, A-8010 Graz, Austria. Fax: (+43) 316 873 8951

Keywords
alkylsilanes . photochemistry . polystyrene . surface modification . UV irradiation

Abstract
Summary: A process for the photochemical modification of polystyrene (PS) surfaces employing organosilane compounds has been developed. Polystyrene was irradiated in presence of trialkylsilanes [ethyldimethylsilane (EDMS), trimethylsilane (TrMS)]. UV irradiation was carried out with a medium pressure (MP) Hg lamp and a 193 nm ArF* excimer laser. FT-IR and X-ray photoelectron spectroscopy (XPS) evidenced that after irradiation alkylsilyl groups were covalently bond to the polymer surface. Contact angle measurements proved a significant lowering in surface energy of polystyrene as a result of the photomodification process. When EDMS was used as photoreactive reagent, the introduction of SiH groups onto the polymer surface was also found. The introduction of SiH bonds onto polymer surfaces provides new possibilities for further surface functionalization. Atomic force microscopy (AFM) showed that Hg lamp irradiation does not exert significant changes in surface topography, while 193 nm excimer laser irradiation leads to surface corrugation. Summing up, it is demonstrated that organosilanes can be employed in UV reactions to attach silyl and also SiH groups onto polystyrene surfaces. Possible reaction mechanisms are discussed.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05938008

http://dx.doi.org/10.1002/macp.200500304