THESIS - ROC CH ... - FINAL - resubmission.pdf - University of Guelph
THESIS - ROC CH ... - FINAL - resubmission.pdf - University of Guelph
THESIS - ROC CH ... - FINAL - resubmission.pdf - University of Guelph
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smaller size <strong>of</strong> P90, the ability to reflect light was minimized causing the films to be more<br />
transparent. At approximately 1% (w/w SPI mass ratio) loading for P90, the visual appearance<br />
was similar to a 0.5% w/w TiO2 loading <strong>of</strong> P25.<br />
P25<br />
P90<br />
0.25% 0.5% 1%<br />
Figure 7.2: Comparison between P25 and P90 SPI/TiO2 blend films with different loading<br />
capacities <strong>of</strong> 0.25%, 0.5%, and 1% (TiO2:SPI mass ratio)<br />
The mechanical properties <strong>of</strong> SPI/TiO2 blend films in both MD and TD configurations are<br />
summarized in Table 7.1. From Figure 7.3, it can be seen that the addition <strong>of</strong> TiO2 had either<br />
negligible effects on TS or an increase compared to the control SPI films. The most notable<br />
increase was seen with the addition <strong>of</strong> 0.25% TiO2 type P90 yielding a TS <strong>of</strong> 9.40 ± 0.69 MPa<br />
and 7.82 ± 1.09 MPa for MD and TD respectively. This is approximately 2 MPa greater than the<br />
control film specimen having a TS <strong>of</strong> 7.28 ± 0.41 MPa and 5.08 ± 0.76 MPa for both<br />
configurations <strong>of</strong> MD and TD respectively. In contrast, the greatest effect for TiO2 type P25 was<br />
93