Synthesis and characterization of thermoplastic composites filled with γ‐boehmite for fire resistance

Abstract

SUMMARYThis paper explores the use of boehmite as a fire retardant in low-density polyethylene and polyamide 6. The structure and morphology of the filler are characterized by X-ray diffraction and scanning electron microscopy. The water content of our boehmite is estimated about 30% by thermogravimetric analysis. The filler/matrix interactions in nanocomposites are investigated by means of thermo-physical measurements: differential scanning calorimeter and thermogravimetry. The resulting morphology shows particles individually dispersed in the matrix. The fire tests present a fire-resistance effect at low filler content despite a different behavior as a function of the matrix. For instance, with only 2% volume of boehmite, the burning time of LDPE composite is significantly increased by 15%. At the same filler content in PA6, the burning time is solely increased by 4.5%. On the other hand, the limiting oxygen index is increased by +7.0% (only 2.6% with LDPE composites).

Viscoelastic behaviour and fracture toughness of linear-low-density polyethylene reinforced with synthetic boehmite alumina nanoparticles

“…In particular, the aggregates of BA give perfectly spherical submicronic particles in the case of LLDPE-D80-4 composite ( Figure 1f). As reported by Droval, this is probably due to a memory form effect coming from the aerosol droplets before drying, resulting in each particle considered as a highly concentrated nano crystallites boehmite aggregates linked together through a water-rich amorphous phase [36]. The XRD diffractograms of BA nanopowders and LLDPE nanocomposites are given in Figure 2a and 2b, respectively.…”

Water-based flame retardant coating using nano-boehmite for expanded polystyrene (EPS) foam

“…Poly(vinyl alcohol) (PVOH) considered as environmentally friendly is a good choice for polymer coating due to its good adhesion property with substrate, no need solvent in coating process, and its charring behavior during burning. As other metal hydroxides, boehmite and pseudo-boehmite have already used to impart flame retardancy in a couple of polymers: ethylene-vinyl acetate copolymer [18,19], polycarbonate/acrylonitrile butadiene-styrene blend [20], poly(methyl methacrylate) [21], polyethylene [22], polyamide 6 [22], polyamide 11 [23], polyester [24,25], polyethersulfone [26] or PVOH [27]. As both boehmite and PVOH are hydrophilic, boehmite can be incorporated into PVOH without pretreatment, only by simply dispersing the two components in water.…”

The effect of boehmite alumina nanoparticles on the properties of polylactide/polypropylene blend composites

“…On the other hand, Zhang et al 27 showed a significant improvement in thermal stability of PE terephthalate in the presence of BA nanoparticles. Droval et al 28 studied the effect of BA on the fire retardance property of LDPE and polyamide 6 (PA-6). They found that the fire burning time was improved for LDPE and PA-6, respectively, at only 2 wt% of BA.…”

“…Droval et al. 28 studied the effect of BA on the fire retardance property of LDPE and polyamide 6 (PA-6). They found that the fire burning time was improved for LDPE and PA-6, respectively, at only 2 wt% of BA.…”