Environmental Engineering Reference
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permeability of nanocomposites decreased substantially with an increase in
clay loading (Figure 13.2). It was marked that the oxygen permeability was
further reduced with an increase in power and frequency of ultrasound. h is
may be due to the removal of microvoids by the application of ultrasound.
h e oxygen permeability of the virgin polymethylmethacrylate (PMMA)
and PMMA/clay nanocomposites can be studied from Figure 13.3. h e
24
22
20
18
16
14
12
10
0
1
2
3
4
Clay content, wt %
Figure 13.2 Oxygen permeability of PAN/clay nanocomposites as a function of clay
content at 5 psi pressure [19].
17.0
16.5
16.0
15.5
15.0
14.5
14.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Clay content, wt %
Figure 13.3 Oxygen l ow rate of PMMA and PMMA/clay nanocomposites with variation
of clay content at a constant pressure (5 psi) [20].
 
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