Structure and Properties of BR Nanocomposites Reinforced with Organoclay

摘要

Butadiene rubber(BR)/organoclay nanocomposites were prepared by direct melt mixing of BRand clay modified with different primary and quaternary ammonium salts.BR/pristine clay composite and BR/organoclay nanocomposites were analysed by X-ray diffraction,scanning electron microscopy,transmission electron microscopy and thermogravimetric analysis.The vulcanization characteristics and the mechanical properties of the BR/ pristine clay and BR/organoclay composites were investigated.The results showed that the interlayer distance of the organoclays was expanded,which indicated that intercalated BR/organoclay nanocomposites had been prepared.Organoclay effectively accelerated the vulcanization of BR,which was attributed to the intercalatant used to modify the clay.The tensile strength,elongation at break and tear strength of BR/organoclay nanocomposites are much higher than those of gum BR vulcanizate and BR/pristine clay composites.The organoclay modified with dimethyl dihydrogenated tallow ammonium chloride(DDAC)gave the best reinforcement effect in BR of all the organoclays.