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Polymer00027 - Ramanathan et al reported that only 0.05 wt...

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16 1.6 Current Research and Objectives 1.6.1 Current Research In the current research, silica and graphite, as attractive types of nanofillers for polymer composites, has gathered much research interest. Storage modulus of polyvinyl acetate (PVAc) was found to increase after the incorporation of nanosilica (Sternstein and Zhu 2002). With the presence of untreated silica nanopowder in PP matrix, tensile strength, Young s modulus as well as toughness of the polymer nanocomposites increased apparently (Rong, et al. 2001). Furthermore, thermal degradation temperature of polyimide/silica nanocomposites was enhanced significantly from 561 o C of the neat polymer to 581, 588, 600 o C by adding 10%, 20%, 30% silica, respectively (Chen, et al. 2004). Graphite is usually treated by oxidation and thermal expansion to get favorable monolayer structures which is named as graphene (Geim and Novoselov 2007).
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Unformatted text preview: Ramanathan et al. reported that only 0.05 wt% treated graphite in polymethyl methacrylate (PMMA) offered an improvement of nearly 30 o C in glass transition temperature of the polymer (Ramanathan, et al. 2008). For fluoropolymer nanocomposites study, nanoclays have been used as reinforcing fillers most frequently. Nanoclay was found to affect vulcanization kinetics of a fluoroelastomer. It could effectively reduce the energy requirement for the curing process of the fluoroelastomer (Kader and Nah 2004) and increase the thermal degradation temperature of the fluoroelastomer in both nitrogen and oxygen atmospheres (Kader, et al. 2006). Meanwhile, M. Maiti, et al., pointed out the concentration of nanoclay in fluoroelastomer influenced dynamic mechanical properties of the composites and 20 wt% nanofiller provided the optimized storage modulus (Maiti and Bhowmick 2006)....
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