Nano Science and Technology Institute
Nanotech 2008 Vol. 1
Nanotech 2008 Vol. 1
Nanotechnology 2008: Materials, Fabrication, Particles, and Characterization - Technical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, Volume 1
Chapter 6: Characterization

Real time Crystallization of Nanoparticles Filled Natural Rubber Under Stretching

Authors:J. Carretero-González, R. Verdejo, S. Toki, B.S. Hsiao, E.P. Giannelis, M.A. Lopez-Manchado
Affilation:Polymer Science and Technology Institute, ES
Pages:838 - 839
Keywords:strain-induced crystallization, nanocomposite, natural rubber, organoclay
Abstract:Polymer nanocomposites (PNCs) represent an alternative new class of materials compared to conventional filled polymers or polymer blends, as they can possess enhanced properties through nanoscale reinforcement.[1] A great deal of efforts have been devoted to understand the reinforcing mechanism of PNCs containing highly anisotropic nanofillers such as nanoclays.[2] In this study, we present experimental evidence of a remarkable enhancement of strain-induced crystallization in natural rubber (NR) nanocomposite under uniaxial stretching due to the presence of nanoclay particles. By using synchrotron wide-angle X-ray diffraction (WAXD), we have monitored the structure changes during deformation in real time. The behavior of significantly enhanced strain-induced crystallinity in organoclay/NR nanocomposites has not been observed before in systems containing conventional fillers. This effect might be responsible for the observed enhancement in mechanical properties of organoclay/NR nanocomposites.[3] The results suggest a dual crystallization mechanism in nanocomposites, which is absent in the unfilled system. The mechanism consists of spatial reorganization of organoclay at low strains (e.g. less than alpha = 3), followed by rapid strain-induced crystallization of NR. The in-situ observed structure changes in NR nanocomposite enable us to suggest a mechanism that may be universal to crystallizable elastomers containing nanosized fillers.
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