Organosilicon polymers are polymers with a molecular structure that contains silicon elements, and the silicon atoms are connected with organic functional groups. According to their chemical structure and properties, they can be classified into three categories: (1) Silicone oil. It is a low-molecular-weight linear structure polymer. (2) Silicone rubber. It is a high-molecular-weight linear structure polymer. (3) Silicone resin. It contains reactive groups and can be further cured. It has properties such as chemical corrosion resistance, heat resistance, cold resistance, and hydrophobicity. 
Explanation 
Organosilicon polymers are polymers whose molecular structure contains silicon elements, and the silicon atoms are connected with organic functional groups. 1 
Classification
According to their chemical structure and properties, they can be classified into three categories: (1) Silicone oil. It is a low-molecular-weight linear structure polymer. (2) Silicone rubber. It is a high-molecular-weight linear structure polymer. (3) Silicone resin. It contains reactive groups and can be further cured as a linear structure polymer. 
According to the product application, they are classified as: silicone oil, silicone rubber, silicone resin, release agent, defoamer, fabric finishing agent, leveling agent, coating, adhesive, sealant, polishing agent, and lubricant. 
According to their three-dimensional structure, they can be classified as: cyclic, linear, trapezoidal, cage-shaped, tree-shaped and three-dimensional network polymers. 
According to the main chain of the molecule, they are classified as: polyorganosiloxanes, polysilanes, and heterochain organosilicon polymers. 
Silicone oil 
Definition: A liquid oil-like substance composed of chain-like structures with different degrees of polymerization, made of polyorganosiloxanes. 
Methyl silicone oil 
The output is the highest; as n increases, the viscosity also increases. If it is less than 106 mPa·s, it is classified as oil. 
Application: 
It is widely used in the electronics and electrical industries. 
Immersion coating on motors, electrical appliances and electronic instruments can enhance the moisture-proof and insulation properties. 
Liquid shockproof material, used as the medium for pressure and temperature transmission in automatic control instruments. 
Low surface tension, widely used in the preparation of food, fermentation, coatings, resins, and as a defoamer for rubber latex. 
Low viscosity improves the fluidity of the coating and maintains the surface integrity of the coating during drying. 
The high viscosity plays a role in disturbing the surface during the drying process of the coating, resulting in "hammer-patterned paint". 
It is used as a demolding agent in the molding and processing of various rubber and plastic products. 
It is widely used in hair care products and skin care products. 
Polyether-modified silicone oil 
A type of oily polymer in which the side chains or main chains of the silicone oil are linked with polyether segments. 
It is widely used in polyurethane foam foaming agents, emulsifiers, cosmetic additives (promoting the diffusion of cosmetics onto the skin or hair, used in shampoo, conditioner, mousse, perfume, soap, skin care products, easy to manage, anti-static, shiny hair), plastic additives, coating wetting agents, fabric hydrophilic anti-static (giving water absorption, sweat absorption, anti-static properties), softening finishing agents, defoamers, glass anti-fog agents, water-soluble lubricants, etc. 2. 
Silicone rubber
The type of rubber with the best cold resistance and heat resistance, which attracted widespread attention in the 1940s, has seen rapid development in terms of variety, performance, application and output. It is an indispensable material in both military and civilian sectors. 
Silicone rubber consists of three components: raw rubber, fillers, and vulcanizing agent. The raw rubber determines the various properties and vulcanization properties of silicone rubber. Fillers are classified into reinforcing fillers, semi-reinforcing fillers, and volume fillers based on their reinforcing capabilities. Silicone rubber can be classified into high-temperature vulcanized (HTV), room-temperature vulcanized (RTV), and addition reaction type silicone rubber 2 according to the vulcanization method. 
Silicone resin 
Silicone resin is mainly an unbranched network structure composed of tri-functional and partially di-functional structural units. It is highly fluid when heated, soluble in organic solvents, and has affinity for the substrate. It can be used as an electrical insulating varnish, coating, molding plastic, laminated material, release agent, and moisture-proof agent. 
Methyl silicone resin 
It is obtained by hydrolyzing and polycondensing methyl trichlorosilane or methyl tris(alkoxy)silane (methoxy, ethoxy), and methyl triacetoxy silane. The hydrolysis and polycondensation reaction is intense and difficult to control. In recent years, the hydrolysis and polycondensation of ethoxy silanes have developed. Methyl silicone resin is an organic silicone transparent resin. After further curing, its crosslinking degree will be very high, with high hardness, good wear resistance, and an appearance similar to glass. It is commonly known as organic silicone glass. 
Methyl phenyl silicone resin 
Methyl phenyl silicone resin is a type of methyl silicone resin with phenyl introduced into it. Pure methyl silicone resin has poor compatibility with pigments and has low thermal elasticity. Introducing phenyl can improve the thermal elasticity, compatibility with organic resins, miscibility with pigments, and adhesion to various substances. Its characteristics are: 
High methyl content: high hardness, low weight loss at high temperatures, good heat shock resistance, fast curing speed, good chemical resistance, good electrical arc resistance, good light retention, good water absorption, and good stability to ultraviolet rays. 
High benzene content: Good thermal stability, high plasticity, excellent antioxidant properties, can maintain flexibility for a long time during thermal aging, good compatibility with common organic resins, good storage stability; poor resistance to organic solvents. 
Organosilicon polymers are the first element-based organic high-molecular substances to be applied industrially, and they are also the fastest-growing field among element-based organic high-molecular substances. Many of their properties are unique and valuable, which cannot be matched or replaced by other organic high-molecular substances. They have become indispensable new polymer materials in the national economy. The future development direction of organosilicon products is towards high performance, multi-functionality and compositization. The research on their applications will aim to meet the needs in energy, electronics, life sciences and new materials.