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Polymer00034 - et al 2003 Silica nanoparticle has been...

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23 2.2 Introduction Polymer nanocomposites have attracted intensive research interest from both academia and industry in the last several decades. This is due to the significant increase in polymer mechanical, thermal, and barrier properties after the incorporation of a small amount of nanofillers such as nanoclay, silica nanoparticle, and functionalized graphene et al. Many studies have been performed on different thermoplastic polymer-nanofiller systems including polylactide (PLA)-clay (Jiang, et al. 2007), polypropylene (PP)-silicate (Gianelli, et al. 2005), polystyrene (PS)-clay (Zeng and Lee 2001), and polyamide (PA)- layered silica (Kim, et al. 2001), on thermoset polymer-nanofiller systems such as epoxy- cellulose nanofiber (Shimazaki, et al. 2007), and on rubber-nanofiller systems such as natural rubber (NR)-clay (Joly, et al. 2002), nitrile rubber (NBR)-clay (Kim, et. al. 2003), and ethylene-propylene rubber (EPM, EPDM)-single-walled carbon nanotubes (Valentini,
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Unformatted text preview: et al. 2003). Silica nanoparticle has been extensively investigated for its potential to improve various properties of polymers. Storage modulus of polyvinyl acetate (PVAc) was found to increase after the incorporation of nanosilica (Sternstein and Zhu 2002). Since one of the critical motivations for the addition of the silica particles is to enhance the mechanical properties, the improvement of mechanical properties of polymer nanocomposites is most concerned. (Zou, et al.2008). With the presence of untreated silica nanoparticle in PP matrix, tensile strength, Young’s modulus and toughness of the polymer nanocomposites increased apparently (Rong, et al. 2001). Other mechanical properties such as impact strength and elongation at break of the polyamide 6/ modified silica nanocomposites prepared by in situ polymerization showed a tendency to increase and then decrease with...
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