The carbon atom in the main chain or side chain of fkm is connected with a fluorine atom with strong electronegativity. Because of the large bond energy of C-F, the valence radius of fluorine atom is 0.64A, which is equivalent to half the length of C-C bond. Fluorine atom can well shield the C-C main chain, ensure the stability of C-C chain, and make it have excellent properties incomparable to other rubbers, such as chemical resistance and good physical properties.
Extended data:
The influence of fkm on fuel;
Infiltration refers to the diffusion process of fuel or oil molecules in various artificial rubber parts of vehicle fuel system. The permeation of hydrocarbon fuel in synthetic rubber vehicle parts is considered to be an important source of hydrocarbon emissions. The promulgation of many local laws and regulations has successfully prompted people to carry out a series of engineering projects and normative measures to improve the permeability resistance of vehicle fuel system.
Fluoro-rubber micropowder is a kind of powdered fluororubber material, which is produced by using carefully selected FKM industrial by-products as raw materials and adopting patented technology-wet conversion process. Many studies show that this material can be reintroduced into the production process of rubber composites. Due to its unique particle morphology and surface activity, fluororubber micropowder can interact with polymer matrix in composites.
Baidu encyclopedia -—fkm