Polymer00052 - FC 2260 and FC 2260/2 T-SiO 2 The highest...

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41 content of the clay within the whole temperature range for both types of clay. However, at the same clay content FS-clay resulted in higher modulus of the composites than S-clay. This was attributed to FS-clay’s higher compatibility with the fluoroelastomer matrix compared to S-clay, due to the former’s treatment by a fluoroaliphatic quaternary ammonium fluorosurfactant. This increased compatibility led to better dispersion of the clay and stronger interfacial bonding between the clay and the matrix. Figure 2.4b compares the modulus of neat FC 2260 and its nanocomposites containing 2% nanofillers. The neat FC 2260 displayed the lowest modulus among all the samples. In other words, all the tested nanofillers stiffened the elastomer. FC 2260/ 2% T-SiO 2 exhibited the highest modulus among the samples and FS-clay, T-G, and UT-SiO 2 filled FC 2260 nanocomposites had their modulus curves lying between those of the neat
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Unformatted text preview: FC 2260 and FC 2260/2% T-SiO 2 . The highest modulus for FC 2260/ 2% T-SiO 2 was the result of T-SiO 2 ’s crosslinking effect. Figure 2.4c compares the modulus of the FC 2260 nanocomposites containing 4% nanofillers. The highest modulus for 2% nanofiller content, e.g. the modulus of FC 2260/ 2% T-SiO 2 , was also drawn for comparison. This figure shows that higher nanofiller content led to higher composite modulus. The modulus of FC 2260/ 2% T-SiO 2 was almost the lowest one in Figure 2.4c. However, FC 2260/ 4% T-SiO 2 still exhibited the highest modulus, especially after the glass transition of the elastomer when the modulus of the samples is crucially determined by the crosslink density. For the same reason, T-G filled FC 2260 nanocomposites exhibited the lowest storage modulus (Figure 2.4b and c) above elastomer T g , due to the hindrance of T-G to the elastomer vulcanization....
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