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Nano boron oxide (B 2 O 3 ) was firstly produced from granular B 2 O 3  by ball milling under cryogenic conditions. Then, PMMA/B 2 O 3  nanocomposites were synthesized by melting method and then characterized. Finally, the rheological properties of PMMA/B 2 O 3  nanocomposite were investigated using a high pressure capillary rheometer. Brauner-Emmet-Teller (BET) surface area analysis showed that the surface area of B 2 O 3  increased with cryogenic grinding. Transmission electron microscopy (TEM) images revealed that B 2 O 3  particles were nano-sized. Scanning electron microscopy (SEM) images showed that the morphology changed with the increase of B 2 O 3  amount. The thermal stability of nanocomposites was found to be better than PMMA. PMMA degraded in two steps, while nanocomposites degraded in one step. It was determined that the amount of residue increased with increasing amount of B 2 O 3 . Both PMMA and nanocomposites exhibited non-Newtonian shear thinning flow behavior. In addition, rheological data were found to be highly compatible with the Power Law model.

Thermal stability and rheological properties of PMMA/B 2 O 3 nanocomposites synthesised by melting method