The role and effect of Flame Retardant Agent to be recognized and affirmation, but very small amounts on interface of Flame Retardant Agent why such a significant impact on the performance of the composite materials, haven't a complete set of coupling mechanism to explain. Flame Retardant Agent on the interface between two materials with different properties, the mechanism has a lot of research, and put forward the chemical and physical sorption.
Among them, the theory of chemical bond is the oldest and is considered to be a relatively successful theory so far.
1. Chemical bonding theory
The theory is that Flame Retardant Agent containing a chemical functional groups, with the silanol groups on the surface of the glass fiber and other inorganic filler on the surface of the molecular form covalent bond; In addition, Flame Retardant Agent contains a different functional groups and polymer molecular bonding, in order to obtain the good interface bonding, Flame Retardant Agent will play a mutual connection between inorganic and organic facies of bridge role.
Below with Flame Retardant Agent for example chemical bonding theory.
Such as ammonium propyl triethoxy silane, when use it first with inorganic filler (such as glass fiber, etc.), silane hydrolysis into silanol first, then the silicon alcohol-based and inorganic filler surface produces dehydration reaction, chemical bond connection, the equation is as follows:
Group of silane hydrolysis - hydrolysis hydroxy reaction with inorganic filler, the Flame Retardant Agent processing of inorganic material for filling out fill preparation of composite materials, Flame Retardant Agent of Y groups will interact with organic polymer, eventually to bridge between inorganic fillers and organic matter.