多壁碳纳米管对微孔硅橡胶泡沫泡孔形貌及介电性能的影响

Effect of multiwall carbon nanotube on the microstructure and dielectric properties of microcellular silicone rubber foams

通过超临界二氧化碳(scCO2)发泡法制备了微孔多壁碳纳米管(MWCNT)/硅橡胶泡沫。探讨了多壁碳纳米管对微孔泡沫的流变性能、泡孔结构、热稳定性以及介电性能的影响。结果表明,多壁碳纳米管的引入有利于提高微孔泡沫的泡孔形貌。此外,当MWCNT含量从0增加到6.0%(质量分数)时,MWCNT/硅橡胶泡沫的初始分解温度从441～467℃。介电结果显示,这种泡沫材料的渗流阈值约为2.0%(质量分数),相应的介电常数和介电损耗分别为8.44,0.02(100Hz)。

A series of microcellular multiwall carbon nanotube (MWCNT)/silicone rubber foams were produced by supercritical foaming method. The effects of MWCNT on the rheological behavior, cellular structure, thermal and dielectric properties of microcellular silicone rubber foams were investigated. The results showed that MWCNT could improve the cellular morphology of microcellular silicone rubber foams. In addition, the onset thermal decomposition temperature of the microcellular MWCNT/silicone rubber foams increased from 441 to 467 ℃ when the MWCNT content increased from 0 to 6.0 wt%. The percolation threshold of the foam materials was nearly 2.0wt%, and the corresponding dielectric constant and dielectric loss of the foams could reach to 8.44 and 0.02 at 100 Hz, respectively.