Abstract
Nanocomposites from organoclay and aromatic polyamide were prepared using solution intercalation method. Aramid chains were synthesised by reacting 4-aminophenylsulfone with isophthaloyl chloride in dimethylacetamide. Dodecylamine was used as a modifier to change the hydrophilic nature of montmorillonite into organophilic. Suitable quantities of organoclay were mixed in the aramid solution with high-speed stirring for homogeneous dispersion of the clay. Thin films cast from these materials after evaporating the solvent were characterised. The morphology of nanocomposites was determined by X-ray diffraction and TEM. Results revealed the formation of delaminated and disordered intercalated clay platelets in the aramid matrix. Mechanical data indicated improvement in the tensile strength and modulus with clay loading up to 6 wt.%. The glass transition temperature increased up to 20 wt.% organoclay, suggesting better cohesion between the two phases and thermal stability augmented with increasing clay loading. The water uptake reduced gradually as a function of organoclay showing decreased permeability.
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Acknowledgements
The authors appreciate the financial support provided by Higher Education Commission of Pakistan (HEC) through project research grant 20-23-ACAD (R) 03-410. Sonia Zulfiqar is thankful to HEC for awarding her fellowship under “International Research Support Initiative Program” (IRSIP) to pursue research work at Max Planck Institute for Polymer Research (MPI-P), Mainz, Germany. Special thanks are due to Prof. Dr. Gerhard Wegner, Director, MPI-P for providing the characterisation facilities for the completion of this work.
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Zulfiqar, S., Rafique, M., Shaukat, M.S. et al. Influence of clay modification on the properties of aramid-layered silicate nanocomposites. Colloid Polym Sci 287, 715–723 (2009). https://doi.org/10.1007/s00396-009-2011-6
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DOI: https://doi.org/10.1007/s00396-009-2011-6