Silicone modifications, surface

Keywords Porous Silicon / Silanes / Surface Modification / Vibrational Spectroscopy... 

Summary Silicones with substituents from natural sources can be synthesized following simple protocols. The modification can be either hydrophilic, oleophilic or both. As hydrophilic substituents carbohydrates and polyethers are used, as oleophilic substituents cholesterol and simple alkyl chains. The physicochemical properties, such as viscosity, reduction of surface tension and emulsification performance, of silicones with standard modifications and of silicone modifications with substituents fit>m natural sources are significantly different. 

Modification of Silicon Wafer Surfaces with Small Organic Moieties... 

We investigated the improvement of the mobility by a HMDS treatment for different polymers. The procedure is based on an optimization of the process developed by Prof. Neher (Universitat Potsdam). At first the silicon dioxide surface is treated with an oxygen plasma (2 min, P = 300 W). Then the sample is deposited into the HMDS vapor for 26 h at 60 C. The last step of this surface modification is rinsing (3 min toluol, 3 min diethylether). 

Keywords Atom transfer radical polymerization, biomaterials, biosurfactants, plasma treatment, polymer brushes, polydimethylsiloxane, silicone rubber, surface modification, voice prostheses... 

Modification of a silicon oxide surface with a self-assembled monolayer that is neutral to PS-b-PMMA, 3-(p-methoxyphe-nyl)propyltrichlorosilane. ... 

Mizutani T, Dale C J, Chu W K and Mayer T M 1985 Surface modification in plasma-assisted etching of silicon Nucl. Instrum. Methods B 7 825-30... 

The chemical bonding theory of adhesion applied to silicones involves the formation of covalent bonds across an interface. This mechanism strongly depends on both the reactivity of the selected silicone cure system and the presence of reactive groups on the surface of the substrate. Some of the reactive groups that can be present in a silicone system have been discussed in Section 3.1. The silicone adhesive can be formulated so that there is an excess of these reactive groups, which can react with the substrate to form covalent bonds. It is also possible to enhance chemical bonding through the use of adhesion promoters or chemical modification of the substrate surface. 

Rebenne, H. E., and Bhat, D. G., Effect of Diffusion Interface on Adhesion and Machining Performance of TiN-Coated Silicon-Nitride Cutting Tools, Proc. ThirdInt. Conf. on Surface Modification Technologies, Neuchatel, Switzerland (Aug., 1989)... 

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