A simple and green method is developed to prepare hexagonal boron nitride （h-BN）/poly（vinyl alcohol） （PVA） nanocomposites by using water as a common solvent ofh-BN nanosheets and PVA. The obtained h- BN/PVA nanocomposites are highly transparent, and have significantly improved mechanical and thermal properties. They may outperform nano-clay and nano-alumina/PVA nanocomposites as flexible optoelectronic devices, optical windows and heat-releasing materials operated in oxidative or corrosive environment.
