Abstract
An effective and facile method was developed to construct the thermal conductive path way in BNNSs-NH2/epoxy/polyetherimide (PEI) ternary blends via reaction-induced phase separation (RIPS). The well dispersed BNNSs-NH2 in the blends was prepared by the urea-functionalization process, which built a bridge to each other at the interface between epoxy and PEI phases. The through-plane thermal conductivity (TC) of composites is enhanced by 83% at low content of 1 wt% BNNSs-NH2. Filler thermal conductive efficiency (η) of BNNSs-NH2 reaches 189 and 83 based on volume fraction and weight fraction, respectively. In addition, the BNNSs-NH2 shows a critical impact on the kinetic of RIPS, which promotes the curing reaction (coarsening process) of epoxy phase. The glass transition temperatures (Tg) of epoxy and PEI were both enhanced due to the amino group of BNNSs and its selective distribution.
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