C. Stafford, A. Fadeev, T. Russell
Sep 15, 2001
Citations
0
Influential Citations
24
Citations
Journal
Langmuir
Abstract
Chemically grafted tris(trimethylsiloxy)silyl (sub)monolayers [tris(TMS)] were prepared on the native oxide of silicon by vapor-phase reaction of the corresponding monochlorosilane at elevated temperatures. By exploiting the inherently sluggish kinetics of the silanization reaction, the grafting density of the tris(TMS) (sub)monolayer can be tuned. Water contact angle, ellipsometry, and X-ray photoelectron spectroscopy were used to determine the surface coverage. Unreacted silanol groups on the substrate surface were used as adsorption sites for carboxylic acid end-functionalized polystyrenes (PS-COOH). The thickness of the adsorbed layer could be controlled by the tris(TMS) surface coverage, adsorbing solvent, and polymer molecular weight. Amino-tris(TMS) mixed monolayers were prepared by the reaction of (4-aminobutyl)dimethylmethoxysilane (ABDMS) with tris(TMS) submonolayers. Polymer adsorption to tris(TMS)/ABDMS mixed monolayers did not occur as readily as it did to the tris(TMS)/silanol surfaces. Aggr...