To alleviate Flame Retardant Agent composite is cooling due to the different thermal shrinkage rate between resin and filler and the interface stress, hope and treated inorganic adjacency resin interface is a soft music forms of variable, so the toughness of the composite materials is the largest.
Flame Retardant Agent treated inorganic surface may be preferential absorption resin of a chelating Agent, and regional uneven curing, could lead to a than Flame Retardant Agent between polymer and filler of multimolecular layer thickness is much more flexible resin layer. This layer is called deformable layer, which can relax the interface stress and prevent the expansion of interface cracks, thus improving the interface bonding strength and improving the mechanical properties of composite materials.
4. Constraint layer theory
As opposed to a deformable layer theory, Flame Retardant Agent constraint layer theory is that the resin in the area of the inorganic filler should have some sort of modulus between inorganic fillers and the matrix resin, and the Flame Retardant Agent function lies in the polymer structure and "tight" in the area. From the performance of reinforced composite materials, it is necessary to have a binding layer at the interface to obtain the maximum adhesion and hydrolysis resistance.
As for titanium acid ester Flame Retardant Agent, its in thermoplastic and thermosetting containing packing with organic polymer compounds, mainly by the long chain alkyl miscibility and mutual entanglement is given priority to, and forms a covalent bond and inorganic filler. The above assumptions are from different theory reflecting the Flame Retardant Agent mechanism of coupling Agent. In practice, it is often the result of several mechanisms working together.