Silicone products properties

Cure systems based on hydrosilylation can be formulated as one and two-part silicone products, that can be either flowing or non-flowing. These formulations provide fast thermal cure rates, they are resistant to humid and other harsh environments, and they have good dielectric properties. These formulations can be self-priming or alternatively the substrate may require priming before application of the silicone. 

Barthel, H., Rosch, L., and Weis, J., Fumed Silica-Production, Properties, and Applications, in Organo-silicon Chemistry II From Molecules to Materials, VCH Weinheim, Germany, 1996 Vol. II, 761. 

Tetraethoxysilane is the main raw stock in the production of valuable silicone products, e.g. heat-resistant and insulating varnishes, or oli-goethylsiloxane liquids. The most important chemical property of tetraethoxysilane is its ability to replace the ethoxyl group with an organic radical under the effect of metalorganic compounds, i.e. to form substituted ethers of orthosilicon acid, which are the raw stock in the production of the silicone products mentioned above. 

Sobolevsky MV, Muzovskaya OA, Popeleva GS (1975) Properties and applications of silicone products. Khimiya Moscow [in Russian]... 

Summary This chapter describes research into magnetic silicone composite properties. The main components of this composite are silicone matrix and magnetic fillers (fine iron and ferrite powders). Composites with changing elasticity can be obtained by modifying matrix composition and the content of fillers. These products are smart materials , and it can be expected that they will have wide application in electronics and electrical engineering... 

Silicone products are, as a result of their exceptional properties, widely utilized as raw materials and additives. They are stable at high temperatures and are resistant to oxidation and weathering. 

Slinyakova, I.B. Denisova, T.I. Organo-silicon Adsorbents Production, Properties, Application Naukova Dumka Kyiv, 1988 (in Russ.). 

Silicon-germanium (SiGe) nanostructures Production, properties and applications in electronics... 

To make a surface-active molecule, one needs to have both a water-soluble and an oil-soluble portion in the molecule. The traditional oil-soluble portion of the molecule is fatty. The silicone surfactants substitute or add on silicone-based hydrophobicity. This results in materials that are more easily formulated into detergent systems and have the improved substantivity, lower irritation, improved softening, and other attributes of silicone and properties one expects from the fatty surfactant. In molecules where silicone is predominate, the functional attributes of silicone will predominate. If the molecule has both a silicone and fatty hydrophobe present, it wiU function with attributes of both of the materials. This allows for the formulation of a wide variety of products, which have oil, water, silicone, or variable solubility. 

Silica gel is a generic name for an adsorbent formed from silicon oxide. There are numerous different silica gels and batch-to-batch variations of product properties may also occur. Silica gels are characterized by their specific surface area (from 5 to 800 rn /g), their pore volume or porosity (from 0.3 to 1 ml/g), the average pore diameter (from 10 to 200 nm), pore size distribution, the particle shape (spherical, ovoid or irregular), particle size (from about 1 nm to 500 nm), size distribution and the surface chemistry (4, 6, 49, 50]. 

The surface applications of silicone products, particularly those based on polydimethylsiloxane (PDMS), are many and varied (7). Familiar examples include release liners for pressure-sensitive adhesives (PSAs), antifoaming agents, and water-repellent treatments for a wide variety of substrates. This broad diversity of application is a direct consequence of the low surface energy of PDMS which is lower than most other polymers except for those based on aliphatic fluorocarbon moieties. Despite the commercial importance of this aspect of the properties of polydimethylsiloxane, there is no fully satisfactory contact angle characterization of PDMS yet available. There is no lack of potential candidates part of the difficulty in identifying a definitive study lies in the breadth of these diverse wetting... 

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