| 查看: 122 | 回复: 4 | |||
| 【奖励】 本帖被评价2次，作者yxsh1125增加金币 1.5 个 | |||
| 当前主题已经存档。 | |||
[资源]
Nanotube Firefighters
|
|||
|
Nanotube Firefighters When polymers are heated and reach the temperature at which they begin to decompose, bubbles often form beneath the surface because the boiling points of the degradation products are usually lower than the decomposition temperature of the parent polymer.The evolution of these bubbles prevents the formation of a solid layer of char, which would insulate the rest of the polymer from further heating.With the advent of restrictions on halogenated flame-retardant additives, nanoscale reinforcing materials, such as clay particles, have been investigated as alternatives. Kashiwagi et al. have found that carbon nanotubes and nanoparticles can also act both as reinforcing materials and as flame retardants, and in some cases can surpass the performance of nanoclay materials. Coaxing the asymmetric fibers into a continuous network structure is the key to reducing bubbling. At fixed loads under radiant heat, the best results were obtained using single-walled carbon nanotubes (SWNTs), which left a residue with an undulating surface but no deep cracks. In contrast, multiwalled carbon nanotubes (MWNTs) yielded only islands of protection, and neither carbon nanofibers (CNF) nor carbon black particles helped very much. Flame retardancy was found to correlate with rheology, because the best materials showed a gel-like response,which matches their ability to form networks. 看完帮忙顶一下，谢谢！ [ Last edited by luo.henry on 2008-4-25 at 15:52 ] |
回复此楼» 猜你喜欢
请教限项目规定
已经有5人回复
-
拟解决的关键科学问题还要不要写
已经有8人回复
-
最失望的一年
已经有16人回复
-
存款400万可以在学校里躺平吗
已经有33人回复
-
求助一下有机合成大神
已经有3人回复
-
求推荐英文EI期刊
已经有5人回复
-
26申博
已经有3人回复
-
基金委咋了？2026年的指南还没有出来？
已经有10人回复
-
基金申报
已经有6人回复
-
疑惑？
已经有5人回复
简单回复
wuyq65022楼
2007-04-06 22:54
回复
