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Polymer00056 - properties compared to UT-SiO 2 reinforced...

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45 2.4.4 Tensile Properties Nanofillers have shown significant influences on the vulcanization of FC 2260 and the morphology of FC 2260 nanocomposites. Therefore, mechanical properties such as tensile strength and tensile modulus are expected to be significantly changed too. Figure 2.6 compares the tensile strength and tensile modulus of the FC 2260 nanocomposites. The addition of the nanofillers increased the tensile strength and modulus of FC 2260, regardless of the nanofiller type and content. For every type of the nanofillers, higher nanofiller content resulted in larger increase in the tensile properties. FS-clay exhibited higher reinforcing effect on both strength and modulus than S-clay because of FS- clay’s higher compatibility with the elastomer matrix and stronger promotion on the elastomer vulcanization. The same comparison is found between T- SiO 2 and UT-SiO 2 . T-SiO 2 reinforced nanocomposites show significantly higher
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Unformatted text preview: properties compared to UT-SiO 2 reinforced ones due to the former’s higher compatibility and stronger promotion on the vulcanization. Indeed, T-SiO 2 reinforced nanocomposites displayed the highest strength and modulus among all the formulations. The chemical bonding between the T-SiO 2 and the fluoroelastomer facilitated T-SiO 2 dispersion and increased interfacial bonding between the two phases. Moreover, the addition of T-SiO 2 promoted elastomer vulcanization and increased crosslink density. These two factors contributed to the composite’s exceptional mechanical properties. T-G also markedly increased the tensile strength and modulus of the elastomer (Figure 2.6). Further increasing T-G content from 2 to 4% only slightly improved the properties, which may be due to particle aggregation at high T-G content. All the tensile properties of each formulation were listed in Table 3....
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