Researchers at the National Institute of Standards and Technology (NIST) have developed a uniform multi-walled carbon nanotube-based fire retardant coating that reduces the flammability of commonly used foam interiors. The combustibility of the carbon nanotube coated polyurethane foam was reduced by 35% compared to the untreated foam.
The researchers uniformly distributed and attached the modified carbon nanotubes to the upper and lower surfaces of the polymer layer. The resulting coating takes full advantage of the rapid heat dissipation of the carbon nanotubes and achieves greater ignition and combustion resistance than the brominated flame retardants commonly used for soft decoration. At the same time, when the nanotube coated foam is exposed to extreme high temperatures, a "carbon protective layer" barrier is created to prevent melt pool formation.
Nanotechnology is the creation and utilization of materials, devices and systems through manipulation of nanoscale materials. For example, the development of nanotechnology at the atomic, molecular and supramolecular levels is increasingly becoming a concern of the world's scientific and technological communities. The focus, who can take the lead in this field, who can occupy the commanding heights of science in the 21st century. A nanocarbon material refers to a carbon material having a dimension of at least one dimension of less than 100 nanometers. Nano-carbon materials mainly include four types: nano-carbon spheres, carbon nanotubes, graphene and carbyne. Among them, carbon nanotubes and graphene are hot research topics in recent years due to their excellent properties.
The elastic modulus of carbon nanotubes is basically the same as that of diamond. It is the highest known material modulus, about 5 times that of steel. Its elastic strain is up to 12%, about 60 times that of steel and the density is only steel. A fraction of a. Carbon nanotubes are about 200 times stronger than other fibers and can withstand pressures of about 1 million atmospheres without breaking. Carbon nanotubes exhibit good electrical conductivity. In a certain direction, the conductivity is up to 10,000 times that of copper. The thermal conductivity of carbon nanotubes is higher than that of natural diamond and graphite atoms.
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