▎ 摘　　要

Locating nanoparticles in selected areas via the mixing of two immiscible polymers is widely studied for achieving nanocomposites with next-level performance, however, the formation of a phase-separated domain constructed with nanofillers from entirely miscible molecules is rarely achieved in the literature. Here we demonstrate a method to fabricate a self-constructed bi-continuous phase structure with localized amine-functionalized graphene nanoplatelets (A-GNPs) in a liquid processable multi-component epoxy blend. Atomic force microscopy infrared spectroscopy (AFM-IR) was employed to identify the compositions of the phase -separated microdomains formed during self-assembly by A-GNP in the multi-component epoxy blend, with incorporating 1-(2-aminoethyl) piperazine (AEPIP) found to be the driving force for the formation of the gra-phene microdomains. Nanoindentation measurements show that a Young's modulus of 6.3 GPa for the graphene domain was achieved, which is nearly twice that of the epoxy resin (3.2 GPa). Transient thermoreflectance re-sults indicate that the thermal conductivity of nanocomposite with phase-separated graphene domain reached 0.48 W/mK, exhibiting a significant enhancement (70%) when compared to epoxy resin, while maintaining excellent dielectric properties. Overall, this study provides a simple and effective route to fabricate phase -separated microstructure with nanoparticles from a liquid processable nanocomposite blend, which shows the great potential of this promising new approach to fabricate nanocomposite films with excellent performance for microelectronics applications.