Properties /Advantages/Characteristics and Uses of Silicone Polymers
Silicones are highly valued materials because they have a combination of physical properties not found in other polymers. They have outstanding heat stability and can be used in applications where organic materials would melt or decompose. Many silicones seem to be impervious to the effects of aging, weather, sunlight, moisture, heat, cold, and some chemical assaults. Some silicones are used to stick, bond, or couple things together as glue.
However, unique surface properties make silicones really different from other materials. The low surface tension of silicone fluids make them ideal for applications such as: paper release agents, fiber lubricants, textile hand modifiers, mbld release agents, antifouling materials and water repellents. In fact, silicones have been used as foam-control agents, anticaking aids, corrosion inhibitors. emulsifiers, lubricants, conditioners, and gloss enhancers all because of their unique surface properties. Some applications of individual silicones are given as under:
Chloromethylsilanes are the basic building blocks of all of our silicon-based materials. They are used in the basic synthesis of silanes and siloxanes and as protecting agents for intermediates in pharmaceutical syntheses.
Chlorosilanes arc essential raw materials in the electronics and telecommunications industries and are used for the production of optical fibers, silicon wafers and chips, as well as the starting material for fumed silicas.
The basic structure of organofunctional silanes is: RnSi(OR)4n(with “R” being an alkyl, aryl. or organofunctional group and with “OR” being methoxy, ethpxy, or acctoxy). Industries that use organofunctional silanes include adhesives and sealants. electronics, foundry resins, glass fibers/fabrics, mineral fillers, paints and coatings. pharmaceuticals.. pigments. silicones, textiles, thermosets, wire and cable. The organofunctionality and primary applications ale as follows.
Adhesion promoter. coupling agent, and resin additive
Improves chemical bonding of resins to inorganic fillers and reinforcing materials
Used for epoxies, phenolics, melamines, nylons, PVC, acrylics. poly(olefins), poly( urethanes), and nitrite rubbers
Surface pretreatment of fillers and reinforcers
Used for free-radical, cross-linked polyester, rubber. noiykolefins). styrenics, and acrylics
Used to couple fiberglass to resins
Used to copolymerize with ethylene
Used to graft to poly(ethylene) for moisture cure
• Adhesion promoter for epbxies, urethanes, and acrylics
Surface treatment for fillers and reinforcers.
Adhesion promoter and coupling agent
Used for free-radical, cross-linked polyester, rubber, poly(olefins). styrenics, and acrylics
Used to couple fillers or fiberglass to resins
Moisture cross-linking of acrylics
Used as coupling agent for inorganic fillers in sulphur-vulcanized rubber mixtures
Hydrophobic surface treatment of fillers and inorganic surfaces
Synthesis of silanes and Silioxanes
Hydrophobic surface treatment
hydrophobic additive to other silane coupling agents
Thermal stability additive to other silanes.