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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Modulus <strong>of</strong> Elasticity (MPa)<br />
120<br />
110<br />
100<br />
90<br />
80<br />
70<br />
60<br />
50<br />
40<br />
Machine<br />
0 0.5 1<br />
Concentration (% w/wSPI)<br />
Figure 7.4: Modulus <strong>of</strong> Elasticity <strong>of</strong> TiO2/SPI blend films<br />
Elongation results are displayed in Figure 7.5. Optimum concentrations for P25 were<br />
not similar to the previous findings. In the MD, EAB was greatest at 0.25% but was still<br />
insignificant compared to the control SPI. In the TD, all additions <strong>of</strong> TiO2 type P25 had<br />
insignificant effects on EAB. For P90, the maximum EAB was seen at a concentration <strong>of</strong> 0.25%<br />
for both MD and TD. These results however are insignificant compared to control. Nonetheless,<br />
it should be noted that the material was not more brittle even though TS was increased at the<br />
same concentration <strong>of</strong> 0.25%. At 1%, it can be seen that EAB decreased in the MD. This<br />
supports the theory <strong>of</strong> aggregated TiO2 particles which cause discontinuity within the protein<br />
matrix leading to premature failure.<br />
97<br />
Transverse<br />
0 0.5 1<br />
Concentration (% w/wSPI)<br />
p25<br />
p90