Synthesis of nano-platelets of modified aluminium hydroxide by high-gravity reactive precipitation and hydrothermal method

摘要

Nano-hexagonal platelets of aluminium trihydroxide (ATH) were first time prepared by high-gravity reactive precipitation, and subsequently were modified as precursor by oxalic acid at hydrothermal condition. A new-style nano-flame retardant named modified aluminium hydroxide (MAH) was therefore obtained. The properties of nano-MAH and nano-ATH were characterized and compared using XRD, TEM, TG-DSC and BET. The results indicate that nano-ATH and nano-MAH have similar crystal structure, particle shape and endothermic enthalpy, however, nano-MAH has higher decomposition onset temperature, i.e. 330 degrees C, higher weight loss rate, i.e. 51 and higher specific surface area, i.e. 34.9 m(2) g(-1). Therefore, comparing with nano-ATH, nano-MAH can be applied in more polymers with the better dispersibility. (c) 2007 Elsevier B.V. All rights reserved.