The basic structural unit of organosilicon products is silicon-oxygen chain -Si(R)2-O-, and various organic groups are connected to the remaining bonds of silicon atoms. From the structural point of view, this type of compound belongs to the semi-inorganic and semi-organic polymer compound, which has the characteristics of both organic and inorganic polymers, so there are many unique features in performance. Compared with other polymer synthetic materials, the most outstanding properties of silicone products are: excellent temperature resistance, electrical insulation, weather resistance, physiological inertia and low surface tension.
Temperature resistance: General polymer synthetic materials are mostly based on carbon-carbon (C-C) bonds as the main chain structure, while silicone products are based on silicon-oxygen (Si-O) bonds as the main chain structure. The bond energy of silicon-oxygen bond of 504KJ/mol is much higher than that of carbon-carbon bond of 345KJ/mol. Therefore, the thermal stability of silicone materials is higher than that of other polymer materials. The use temperature is >180, and some silicone resins are used. The temperature is as high as 500 or more. When it burns, it generates incombustible silica and extinguishes itself, releasing carbon dioxide and water, with low toxicity. Silicone materials can withstand high temperatures as well as low temperatures (usually -60). What's more valuable is that its chemical properties and physical and mechanical properties change little with temperature, which is related to the flexible spiral structure of the organic silicon material molecules. The extension of the helical structure eliminates the change in the distance between molecules, so that the average distance between molecules is only slightly affected by temperature changes, so there is basically no change in various properties.