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Physical structure, properties and temperature resistance of organosilicon

Organosilicon material has a unique structure:
(1) Adequate methyl groups on Si atoms shield the high energy polysiloxane main chain;
(2) C-H is non-polar, so that the interaction between molecules is very weak;
(3) Si-O bond length is longer and Si-O-Si bond Angle is larger.
(4) Si-O bond is a covalent bond with 50% ionic bond characteristics (covalent bond has directivity, ionic bond has no directivity).
Characteristics of organosilicon materials:
Organic silicon products basic structure unit is composed of silica link, structure contains both "organic groups" and "inorganic structure" of this special composition and molecular structure make it combines the characteristics of organic matter and inorganic matter functions in one, compared with other polymers, organic silicon elastic coating is the most outstanding performance is excellent heat-resistant properties, dielectric properties,Weathering resistance film forming ability and low surface tension, small viscose-temperature coefficient, high compressibility, high gas permeability basic properties, and has high and low temperature resistance, electrical insulation, oxidation stability, weather resistance, flammability, detest water, corrosion resistance, non-toxic tasteless and physiological inert and other excellent characteristics,Widely used in aerospace, electronic and electrical, construction, transportation, chemical, textile, food, light industry, medical and other industries, among which silicone is mainly used in sealing, bonding, lubrication, coating, surface activity, demolding, defoaming, foam suppression, waterproof, moistureproof, inert filling, etc..With the continuous growth of the number and varieties of organosilicon, its application fields are constantly broadened, forming a unique and important product system in the field of new chemical materials. Many varieties are indispensable and irreplaceable by other chemicals.
Organosilicon is also needed in the metabolism of organisms, and its chemical formula is usually CH3(SiOH)3.Silicone plays an important role in various functions of the body and is directly related to mineral absorption.The average human body has about seven grams of silicon, far more than other important minerals such as iron.Iron and silicon are essential to the human body and are important for maintaining a normal metabolism.
Silicone materials according to their different forms, can be divided into: silane coupling agent (organic silicone chemical reagent), biological active silicone, silicone oil (silicone grease, silicon emulsion, silicon surface active agent), high temperature vulcanized silicone rubber, liquid silicone rubber, silicone resin, complex, etc..
Temperature resistance of organosilicon
Most of the general polymer materials are based on carbon-carbon (C-C) bond as the main chain structure, such as:Rubber, plastic, chemical fiber, etc., and the organic silicon product is silicon (Si - O - oxygen key chain structure, C - C key in the key to 82.6 kcal/mol, Si - O can key in the key in the organic silicon is 121 kcal/mol, so the thermal stability of silicone products, high temperature (or radiation exposure) molecular bonds do not broken, do not break down.Silicone is resistant not only to high temperatures but also to low temperatures and can be used over a wide temperature range.Both chemical properties and physical and mechanical properties change very little with temperature, which is also related to the fact that organosilicon molecules are easily disturbed by the spiral structure.
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