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Hexagonal boron nitride (h‐BN) micro‐platelets were surface‐functionalized by sulfuric acid (SA). Such modified h‐BN powders were mixed with thermoplastic polyether imide (PEI) to prepare flexible composite films using a solution casting method. After surface modification, the h‐BN powders were uniformly dispersed in the PEI matrix. The thermal conductivity of the flexible composite materials was...
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