Dielectric Polymer Nanocomposite with Interconnected Boron Nitride Nanosheets for Thermal Management Application

摘要

The continuous evolution toward semiconductor technology in the “more-than-Moore” era and rapidly increasing power density of modern electronic devices call for advanced thermal interface materials (TIMs). Here we construct flexible polymer nanocomposite TIMs for advanced thermal management applications. Firstly, aligned polyvinyl alcohol (PVA) supported and interconnected 2D boron nitride nanosheets (BNNSs) composite fiber membranes were fabricated by electrospinning. Then the nanocomposite TIMs were constructed by rolling the PVA/BNNS composite fiber membranes to form cylinders and subsequently vacuum-assisted pouring polydimethylsiloxane (PDMS) into the cylinders. The nanocomposite TIMs not only exhibit super-high through-plane thermal conductivity enhancement of about 10 times at a low BNNS loading of 15.6 vol% compared with pristine PDMS, but also show high volume electrical resistivity. The nanocomposites show strong potential of thermal management applications for high-power electronic devices.