Molecular structure and mechanism of action of silane coupling agent

Silane coupling agent is a kind of low molecular organosilicon compound with special structure, and its general formula is RSiX3, type R has affinity with polymer molecules or ability to respond to the activity of functional groups, such as oxygen radicals, sulphur, vinyl, epoxy group, propyl amide, ammonia, etc; X represents the alkoxy to hydrolysis, such as halogen, alkoxy, acyl oxygen radicals, etc.
In the coupling, the first X base water forming silanol, then react with inorganic powder particles on the surface of the hydroxyl, formation of hydrogen bonds and condensed into - SiO - M covalent bond (M says inorganic powder particle surface). At the same time, silane molecules silanol and mutual association in forming the reticular structure of the membrane covering the surface of powder particle, the organic inorganic powder surface.

(source:http://www.ac-chem.net/news/silane-coupling-agent-b24c.html)