Figure 20 illustrates the effects of ultrasonification time on tensile strength. The samples
were prepared with 5% Cloisite Na+ as indicated in Table 12. The TS of starch composite
films tends to increase with increasing ultrasonification times. The data in Figure 20 can
be grouped into three sections (I, II an III). Section I contains the pure mung bean starch
samples with the lowest tensile properties. Section II depicts starch/clay composite
samples with improved tensile properties. The non-ultrasonified clay composites show
only slight improvement over the control. The tensile properties of composites are
constant up to 10 minutes of ultrasonification and reveal greater TS properties than the