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Silicone rubber
- Aug 21, 2018 -

Silicone rubber refers to a rubber whose main chain is composed of alternating silicon and oxygen atoms, and usually has two organic groups attached to the silicon atom. Ordinary silicone rubber is mainly composed of a silicone chain containing a methyl group and a small amount of a vinyl group. The introduction of phenyl can improve the high and low temperature resistance of silicone rubber, and the introduction of 3,3-trifluoropropyl group and cyano can improve the temperature resistance and oil resistance of silicone rubber. Silicone rubber has good low temperature resistance and generally works at -55 °C. After the introduction of the phenyl group, it can reach -73 °C. The heat resistance of silicone rubber is also outstanding. It can work for a long time at 180 ° C. It can withstand elasticity for several weeks or more at a temperature slightly higher than 200 ° C. It can withstand high temperatures above 300 ° C instantaneously. Silicone rubber has good gas permeability and the highest oxygen transmission rate among synthetic polymers. In addition, silicone rubber is also physiologically inert and does not cause prominent characteristics of blood coagulation, and thus is widely used in the medical field.