Surface modification magnesium hydroxides

In numerous works dealing with the combination of nanoparticles and FR compounds, surface modifications of nanoparticles were only aimed to promote good dispersion of the nanoparticles into the polymer matrix (with intercalated or exfoliated morphologies for layered silicates as nanoparticles), even in the presence of the usual FRs, for example ammonium polyphosphate (APP) or magnesium hydroxide (MH). The initial aim was to combine the individual effects of each component to achieve strong synergistic effects. 

Schofield, W.C.E., Hurst, S.J., Lees, G.C., Liauw, C.M., and Rothon, R.N. (1998) Influence of surface modification of magnesium hydroxide on the processing and mechanical properties of composites of magnesium hydroxide and an ethylene vinyl acetate copolymer. Compos. Interface, 5 (6). 515-528. 

Of the hydrated fillers evaluated, magnesium hydroxide is more efficient than MgCaCOs. Surface modification of magnesium hydroxide preserves impact properties. Addition of glass fibers increases the strength, rigidity, and dimensional stability of halogen- and red phosphorus-free flame-retardant aliphatic polyketone compositions. 

Keywords. Polyethylene, magnesium hydroxide, fire retardcuicy, surface modification, coupling agent... 

The aim of the study was to assess the impact of surface modification of magnesium hydroxide on the flammability and mechanical properties of composites PE-HD/ MDH. The surface treatments can decrease the surface energy of inorganic fillers and improve the dispersion of an inorganic filler in a polymer matrix. The mechanical performance and flame retardancy of the PE-HD/MDH composites largely depend on the dispersion of fillers in the polymer matrix and the adhesion between the filler particles and polymer matrix. Different surface treatments of commercial magnesium hydroxide obviously affect interactions between fillers and the polymer matrix. 

The thermogravimetric analysis was conducted in order to determine the effect of surface modification of magnesium hydroxide on the thermal stability and the depending function on the magnesium hydroxide mass loss with increasing temperature (Table 4.3... 

The increase of unmodified (MDH3) and surface modified by aminosilane (MDH2) magnesium hydroxide used in high-density polyethylene increases the strength and modulus and decreases the elongation as compared to PE-HD. Surface modification of... 

---