Morphological hierarchy of butadieneacrylonitrile/montmorillonite nanocomposite

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Abstract

A hierarchical model of the morphology of amine terminated butadieneacrylonitrile-montmorillonite nanocomposite was established. The composite was prepared by ion exchange between the onium salt of the polymer (ATBN) and the interlamellar cation of the mineral (MMT). Composite containing 40% mineral was obtained. Chemical analysis indicated that all the ionic sites of the mineral have been occupied by polymer end groups. The d(001) spacing and the span between the internal lamellar surface were only expanded to about 14 Å and 5 Å, respectively, suggesting horizontal packing of the polymer molecules. TEM examination of microtome sections, prepared from compression molded samples, revealed that the lamellae, laminated with polymers assembled into multiplets of about 5 nm. On the other hand, the multiplets appear to assemble into mineral rich domains whose average size was 250 nm.

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