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Layered Silicate/ATBN Nanocomposite

Published online by Cambridge University Press:  15 February 2011

A. Moet ,
A. Akelah ,
N. Salahuddin ,
A. Hiltner  and
E. Baer
A. Moet
Affiliation:
Department of Macromolecular Science, Case Western Reserve University, Cleveland, OH 44106-7202
A. Akelah
Affiliation:
Department of Chemistry, Tanta University, Tanta, Egypt
N. Salahuddin
Affiliation:
Department of Macromolecular Science, Case Western Reserve University, Cleveland, OH 44106-7202
A. Hiltner
Affiliation:
Department of Macromolecular Science, Case Western Reserve University, Cleveland, OH 44106-7202
E. Baer
Affiliation:
Department of Macromolecular Science, Case Western Reserve University, Cleveland, OH 44106-7202
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Abstract

Composites of amine terminated butadieneacrylonitrile (ATBN) and montmorillonite (MMT) were prepared by ion exchange between the onium salt of the polymer and the interlamellar cation of the mineral following two different preparation approaches. The first carried out the ion exchange in situ and used dioxane, a better solvent for the polymer, and the second administered the onium salt to MMT using dimethylsulfoxide (DMSO). Elemental analysis and IR spectroscopy 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 lamelar surface were only expanded to about 14 Å and 5 Å, respectively, suggesting horizontal packing of the polymer molecules. TEM of microtome sections prepared from compression molded composites revealed that the lamellae, laminated with polymers assembled into multiplets of about 5 nm for both preparations. The multiplets clustered into mineral rich domains whose average size was 250 nm for the DMSO preparation. Finer clusters (70 nm) were obtained by the first method. This three fold decrease in the average domain size was attributed to the strong solvation power of dioxane in the binary solvent and to the locale of ion exchange.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 351: Symposium V – Molecularly Designed Ultrafine/Nanostructured Materials , 1994 , 163
Copyright
Copyright © Materials Research Society 1994

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