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Effect of thermally stable oligomerically modified clay on the properties of aramid-based nanocomposite materials

Published online by Cambridge University Press:  31 January 2011

Sonia Zulfiqar  and
Muhammad Ilyas Sarwar
Sonia Zulfiqar
Affiliation:
Department of Chemistry, Quaid-i-Azam University, Islamabad-45320, Pakistan
Muhammad Ilyas Sarwar*
Affiliation:
Department of Chemistry, Quaid-i-Azam University, Islamabad-45320, Pakistan; and Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Oligomerically modified reactive montmorillonite clay was used in the preparation of aramid-layered silicate nanocomposites. The dispersion behavior of organoclay was monitored in the aramid matrix synthesized from 4-aminophenylsulfone and isophthaloyl chloride in dimethylacetamide. These polyamide chains were end-capped with carbonyl chloride groups to interact chemically with oligomerically modified layered silicate. Thin composite films containing 2 to 20 wt% of organoclay were probed for x-ray diffraction (XRD), transmission electron microscopy (TEM), mechanical testing, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and water absorption measurements. XRD and TEM results described the distribution level of clay platelets and morphology of hybrid materials. Mechanical measurements revealed that modulus and strength improved up to 6 wt% clay loading, while toughness of nanocomposites increased with the addition of 2 wt% clay content in the matrix. The elongation showed a decreasing trend with increasing clay content in the hybrids. Thermal-decomposition temperatures of the nanocomposites were in the range 225 to 450 °C. The glass-transition temperature increased up to 12 wt% addition of organoclay in the matrix relative to pristine aramid depicting interfacial interactions among the phases. Water absorption of the nanocomposites reduced with augmenting organoclay loading, indicating decreased permeability.

Keywords

CompositePolymerX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 12: Biomimetic and Bio-enabled Materials Science and Engineering , December 2008 , pp. 3330 - 3338
Copyright
Copyright © Materials Research Society 2008

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