Influence of aspect ratio on barrier properties of polymer-clay nanocomposites |
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| Authors: | Lu Chunsheng Mai Yiu-Wing |
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| Institution: | Centre for Advanced Materials Technology, School of Aerospace, Mechanical, and Mechatronic Engineering J07, The University of Sydney, Sydney, NSW 2006, Australia. chunsheng.lu@aeromech.usyd.edu.au |
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| Abstract: | The barrier properties of polymer-clay nanocomposites, with far less inorganic contents of layered-silicate fillers, are remarkably superior to those of neat polymers or their conventional counterparts. A simple renormalization group model is proposed to assess the influence of geometric factors (such as aspect ratio, orientation, and extent of exfoliation) of layered-silicate fillers on the barrier properties of polymer-clay nanocomposites. The results show that the aspect ratio of exfoliated silicate platelets has a critical role in controlling the microstructure of polymer-clay nanocomposites and their barrier properties. The estimated percolation thresholds of clay content for minimum permeability are in good agreement with experimental data. |
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