Hydroxyl-functionalized hexagonal boron nitride (OH-h-BN) nanoplatelets improved thermal conductivity for chitosan microspheres (CSM) . OH-h-BN/CSM nanocomposites exhibit thermal conductivity of 5.66 W•m -1 •K -1 . It showed 502% and 1914% enhancement compared to OH-h-BN/CS nanocomposites and pure chitosan, respectively . A simple and environmentally friendly strategy was reported to fabricate epoxy/BN composites . The synthesis method improved the through-plane TC of the prepared composite. The effect of filler sizes of BN on thermal conductivity was also investigated. The data analysis showed that the high content of BN in the epoxy composite ensured a higher through-plane TC of 2.01