| Summary: | 碩士 === 中興大學 === 化學系所 === 94 === Nanocomposites based on polyvinyl alcohol(PVA) and multi-wall carbon nanotubes were sonication blended, yielding a good dispersion of nanotubes without using any organic treatment or additional additives. As these synthetic materials are flammable, they require modifications to decrease their flammability through the addition of flame-retardant compounds. Environmental regulation has restricted the use of some halogenated flame-retardant additives, initiating a search for alternative flame-retardant additives.
Carbon nanotubes are highly attractive for this purpose, because they can simultaneously improve both the physical and flammability properties of the polymer nanocomposite. Carbon nanotubes are found to significantly enhance the thermal stability of polyvinyl alcohol in nitrogen at high temperatures. Specifically, the carbon nanotube additive greatly reduced the heat release rate of polyvinyl alcohol. They are found to be at least as effective a flame-retardant as CNT/ PVA nanocomposites.
The effects of the dispersion and concentration of carbon nanotube on the flammability of CNT/ PVA nanocomposites were investigated. The thermal and flammability properties of CNT/ PVA nanocomposites were measured with the CNT content varied from 1 to 10% by mass. Dispersion of CNT in these nanocomposites was characterized by SEM and optical microscopy.
|
|---|
