Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 260, Issue 2, Pages 374-378Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S0021-9797(03)00039-0
Keywords
hyperbranched polymer; aziridine; poly(ethyleneimine); surface-initiated polymerization; silica substrate
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Silica solid substrates such as fused silica, silicon wafers with a natural oxide layer, and glass were treated with aziridine to produce reactive primary amine groups on the top surface. We found that the hydroxyl group on the substrate was able to initiate the ring-opening polymerization of aziridine, resulting in highly branched poly(ethyleneimine) on the surface. In dichloromethane, the thickness of the organic film reached 25 Angstrom in 20 h and the absolute density of the primary an-tine group on the surface was 23 amines/nm(2). Atomic force microscopy shows an embossed morphology after the polymerization in dichloromethane, while use of toluene gives a rather smooth surface. The resulting organic layer shows high thermal and pH stability. (C) 2003 Elsevier Science (USA). All rights reserved.
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