Combustion and fire retardancy of aliphatic nylons

Hybrid Polyamide/Silica Nanocomposites: Synthesis and Mechanical Testing

“…Clear, transparent solutions were obtained which resulted in better control of homogeneity at the macromolecular level. This is an important requirement for all ensuing properties/processes to be investigated, for example in the areas of chemical modifications (e. g. addition of soluble organic dyes [29] and fire retardants [30] ), mechanical reinforcements (e. g. formation of transparent electrospun fibers [31] ) and processing (e. g. spin coating, casting).…”

Preparation and Combustion Properties of Flame Retardant Nylon 6/Montmorillonite Nanocomposite

“…They have effective flame retardancy, high temperature resistance, good processability and excellent compatibility with fibre reinforcement and polymer matrix. The three basic fire-retardant mechanisms of DB and AO additives in aliphatic nylons are: [18,19] (1) Generation of free-radical chain-terminating agents;…”

“…[19,20] The adding of DB and AO to polymer, PA6, and to the nanocomposite, PA6-n has effect on the combustion test (shown in Figure 3, 4). The HRR for PA6/DB-AO increases earlier and faster than pure PA6, getting its peaks to 673 kW Á m À2 after 120 s, and then decreases sharply.…”

“…The slower thermal decomposition of the PA-n/DB-AO may be ascribed to the barrier and labyrinth effects of the nano-dispersed silicate layers. Probably, there are synthetic effects among clay, DB-AO and PA6 due to reaction (2)-(6): [15,16,18,19,23] ð2Þ ð3Þ ð4Þ ð5Þ ð6Þ A reaction between AO and sodium bromide, present as an impurity in the commercial clay as a residue of clay exchange to intercalate the ammonium ion, gets antimony tribromide, a well-known gas phase fire retardant.…”

Polymers on Fire

“…An efficient route of minimizing the trace amounts of phosphine involves the incorporation of metal oxides (such as copper oxide, cadmium oxide, or zinc oxide), which transform phosphine into phosphoric acid. Alternatively, prior to use, red phosphorus can be coated with a resin [50,56,57].…”