Ultra-flexible polymethyl methacrylate composites induced by sliding of micron-sized hexagonal boron nitride platelets

An ultra-flexible hexagonal boron nitride (h-BN)/ polymethyl methacrylate (PMMA) composite with extra-large elongation at rupture was prepared by introducing micron-sized surface-modified h-BN platelets into a PMMA matrix. At 32 wt% loading of surface-modified h-BN, the composite can be folded freely and has an elongation at rupture of 68%, which is over 30 times larger than that of PMMA. Such results are due to the lubricant nature and the sliding of h-BN platelets.