Flame-retardent foam thanks to nanotube coating

US National Institute of Standards and Technology (NIST) researchers have developed a uniform, multi-walled carbon-nanotube-based coating that reduces the flammability of foam commonly used in upholstery.

According to NIST, the flammability of the nanotube-coated polyurethane foam was reduced 35 per cent compared with untreated foam. The coating also prevented melting and pooling of the foam, which generates additional flames that are a major contributor to the spread of fires.

In the US, fires in which upholstered furniture is the first item ignited account for about 6,700 home fires annually and result in 480 civilian deaths, or almost 20 per cent of home fire deaths between 2006 and 2010, according to the National Fire Protection Association.

The NIST technique squeezes nanotubes between two polymers and stacks four of these trilayers on top of each other.

The result is a plastic-like coating that is thinner than one-hundredth the diameter of human hair and has flame-inhibiting nanotubes distributed evenly throughout.

Developed by NIST materials scientists Yeon Seok Kim and Rick Davis, the fabrication method is described in the January 2014 issue of Thin Solid Films.

Kim and Davis write that the technique can be used with a variety of types of nanoparticles to improve the quality of surface coatings for diverse applications.

The pair experimented with a variety of layer-by-layer coating methods before arriving at their triple-decker approach. All had failed to meet their three key objectives: entire coverage of the foam’s porous surface, uniform distribution of the nanotubes, and the practicality of the method. Inmost of these trials, the nanotubes did not adhere strongly to the foam surface.

Kim and Davis opted to modify the nanotubes themselves, borrowing a technique often used in cell culture to make DNA molecules stickier. The method attached nitrogen-containing molecules (amine groups) to the nanotube exteriors.

The doctored nanotubes were uniformly distributed and adhered to the polymer layers above and below. Consequently, the coating fully exploits the nanotubes’ rapid heat-dissipating capability.

The resulting coating is claimed to confer much greater resistance to ignition and burning than achieved with the brominated flame retardants commonly used to treat soft furnishings.

As important, said Davis, a ‘protective char layer’ forms when the nanotube-coated foam is exposed to extreme heat, creating a barrier that prevents the formation of melt pools.

‘This kind of technology has the potential to reduce the fire threat associated with burning soft furniture in homes by about a third,’ Davis said in a statement.

An easy-to-apply, NIST-developed coating significantly reduces the flammability of foam used in furniture. The thin coating is deposited onto the surface of all the nooks and crannies of the porous foam (top), with heat-dissipating multiwalled carbon nano
An easy-to-apply, NIST-developed coating significantly reduces the flammability of foam used in furniture. The thin coating is deposited onto the surface of all the nooks and crannies of the porous foam (top), with heat-dissipating multiwalled carbon nanotubes uniformly distributed throughout (bottom)