Novel Polyarylene Ether Nitrile/BaTiO₃-Decorated WS₂ Nanohybrid Crosslinked Nanocomposites for Thermal-Stable...

To prepare high-temperature-resistant dielectric composite films, a novel three-dimensional nanofiller was fabricated using carboxylated polyarylene ether nitrile as a bridge, which tightly loads BaTiO₃ nanoparticles onto WS₂ nanosheets (WS₂@BT) via in situ chemical bonding. Afterward, the WS₂@BT nanofiller was introduced into the polyarylene ether nitrile (PEN) matrix, and high-temperature heat treatment was performed to form a crosslinked network, yielding CPEN/WS₂@BT nanocomposites. Notably, the modified WS₂@BT effectively improves the compatibility between the nanoparticles and the PEN matrix, which is superior to the compatibility of unmodified nanofillers with the matrix. Moreover, after crosslinking, CPEN/WS₂@BT exhibits excellent comprehensive performance: when the filler content is 30 wt%, its glass transition temperature (T_g) reaches 257.83 °C, significantly higher than that of PEN/WS₂@BT, and its dielectric constant is 193% higher than that of pure CPEN. In addition, the dielectric temperature coefficient remains below 1 × 10^-3 °C^-1 in the range of 25-220 °C. Overall, this work provides an effective and reliable strategy for preparing high-performance, high-temperature-resistant composite dielectric films.