This study reports that a novel high-temperature poly (m-phenyleneisophthalamide) (PMIA) composite with enhanced dielectric constant and thermal conductivity was prepared by filling with BaTiO₃ nanowires–carbon nanotubes (BTCNs) fillers. Due to effective functionalization of BaTiO₃ nanowires (BTNWs) and multi-wall carbon nanotubes (MWCNTs), the fabricated BTCNs fillers were homogeneously dispersed in PMIA matrix. The consequence displays that the dielectric constant of PMIA composite with 15 wt % BTNWs fillers increases to 27.6 at 10³ Hz, which is about nine times higher than that of pure PMIA. Moreover, owing to the high thermal conductivity of MWCNTs, the thermal conductivity of PMIA with 15 wt% BTNWs fillers increases to 1.01 W/(mK). The enhanced thermal conductivity is beneficial for BTCNs/PMIA composite to dissipate the generated heat by dielectric loss. Considering these merits, this research would provide new methods and ideas for preparation of high-temperature dielectric polymer composites and reducing the internal thermal effect.

该研究报告称，通过填充 BaTiO ₃纳米线-碳纳米管 (BTCNs) 填料制备了一种新型高温聚（间苯二甲酰间苯二甲酰胺）（PMIA）复合材料，其具有增强的介电常数和热导率。由于 BaTiO ₃纳米线 (BTNWs) 和多壁碳纳米管 (MWCNTs) 的有效功能化，制备的 BTCNs 填料均匀分散在 PMIA 基质中。结果表明，含 15 wt% BTNWs 填料的 PMIA 复合材料的介电常数在 10 ^{3 时}增加到 27.6 Hz，大约是纯 PMIA 的 9 倍。此外，由于 MWCNTs 的高热导率，含 15 wt% BTNWs 填料的 PMIA 的热导率增加到 1.01 W/(mK)。增强的导热性有利于 BTCNs/PMIA 复合材料通过介电损耗散发产生的热量。考虑到这些优点，本研究将为高温介电聚合物复合材料的制备和降低内部热效应提供新的方法和思路。