Polyimides (PIs) and their composites hold promise as low-cost alternatives to conventional ceramic-based dielectrics. Nevertheless, they are far unsatisfactory for practice applications, mainly resulting from the low interfacial compatibility between PI matrices and inorganic fillers. Herein, black phosphorous (BP) nanoflakes/PI composite films with outstanding dielectric and mechanical properties were fabricated via an in situ polymerization pathway. Owing to the hydrophilic surface of BP nanoflakes resulting from slight oxidation during fabrication, the robust noncovalent interaction between BP and PI can be formed, leading to good interfacial compatibility between the two domains and thus well dispersion of BP in PI. Even with a low BP content of 2 wt%, the composite can reach a high-permittivity value of 8.6 at 10² Hz and a low dielectric loss value of 0.02. Moreover, the BP/PI composite films inherited the good mechanical performance of PI matrix due to homogeneous dispersion and low loading of BP.

中文翻译：

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黑磷纳米薄片/聚酰亚胺复合薄膜，具有出色的介电和机械性能

聚酰亚胺（PI）及其复合材料有望作为传统陶瓷基电介质的低成本替代品。但是，它们在实际应用中还远远不能令人满意，这主要是由于PI基质与无机填料之间的界面相容性低。本文中，通过原位聚合途径制备了具有优异介电和机械性能的黑色磷（BP）纳米片/ PI复合膜。由于在制造过程中轻微的氧化导致BP纳米薄片的亲水性表面，可以在BP和PI之间形成牢固的非共价相互作用，从而导致两个结构域之间的良好界面相容性，从而使BP在PI中具有良好的分散性。即使在2 wt％的低BP含量下，复合材料在10 ^2时也可以达到8.6的高介电常数Hz和低介电损耗值0.02。此外，BP / PI复合膜由于均匀分散和低BP负载而继承了PI基体的良好机械性能。