2. Reactive systems

In order to guarantee the durability of a material's flame-retardant properties and avoid the release of potentially hazardous compounds into the atmosphere, it appears necessary to immobilize the phosphorus-containing flame retardant within the polymer structure. This can be achieved by creating a covalent bond between the phosphorus flame retardant and the matrix to be flame-retarded. In this way, migration and release of the phosphorus-containing flame retardant into the atmosphere becomes impossible. Moreover, plasticization associated with the incorporation of an additive can also be limited or even cancelled, and the mechanical properties of the flame-retardant materials maintained. In the reactive approach, the phosphorus flame retardant must therefore possess one or more system-reactive functions within its structure. These reactive functions are linked to the nature of the polymer....