Trommer Kristin, Gnanaseelan Minoj
FILK Freiberg Institute gGmbH, Meißner Ring 1-5, 09599 Freiberg, Germany.
Materials (Basel). 2021 Dec 18;14(24):7841. doi: 10.3390/ma14247841.
The incorporation of MWCNTs in polymer systems up to the percolation range renders them electrically conductive. However, this conductivity is not high enough for heating applications in the low-voltage range (<24 V). The combination of nanoscaled MWCNTs with microscaled short SWCNT fibers that was investigated in this study causes an abrupt rise in the conductivity of the material by more than an order of magnitude. Silicone was used as a flexible and high-temperature-resistant matrix polymer. Conductive silicone coatings and films with SWCF contents of 1.5% to 5% and constant MWCNT contents of 3% and 5% were developed, and their electrical and thermal properties in the voltage range between 6 and 48 V were investigated. The electrical conductivity of 3% MWCNT composite materials rose with a 5% addition of SWCFs. Because of this spike in conductivity, output power of 1260 W/m was achieved, for example, for a 100 µm thick composite containing 3% MWCNT and 4% SWCF at 24 V with a line spacing of 20 cm. Thermal measurements show a temperature increase of 69 K under these conditions. These findings support the use of such conductive silicone composites for high-performance coatings and films for challenging and high-quality applications.
在聚合物体系中加入多壁碳纳米管（MWCNTs）直至渗滤范围可使其具有导电性。然而，这种导电性对于低电压范围（<24 V）的加热应用来说还不够高。本研究中所研究的纳米级多壁碳纳米管与微米级短单壁碳纳米管（SWCNT）纤维的组合导致材料的导电性急剧上升超过一个数量级。硅酮被用作一种柔性且耐高温的基体聚合物。制备了SWCF含量为1.5%至5%且MWCNT含量恒定为3%和5%的导电硅酮涂层和薄膜，并研究了它们在6至48 V电压范围内的电学和热学性能。3% MWCNT复合材料的电导率随着添加5%的SWCF而上升。由于这种电导率的激增，例如，对于在24 V下、线间距为20 cm的含有3% MWCNT和4% SWCF的100 µm厚复合材料，实现了1260 W/m的输出功率。热测量表明在这些条件下温度升高了69 K。这些发现支持将这种导电硅酮复合材料用于具有挑战性的高质量应用的高性能涂层和薄膜。
