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《科学》最新文章：Layered Polymer Nanocomposites
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Science 5 October 2007: Vol. 318. no. 5847, pp. 80 - 83 Reports Ultrastrong and Stiff Layered Polymer Nanocomposites Paul Podsiadlo,1 Amit K. Kaushik,2 Ellen M. Arruda,2,3 Anthony M. Waas,2,4 Bong Sup Shim,1 Jiadi Xu,5 Himabindu Nandivada,1 Benjamin G. Pumplin,2 Joerg Lahann,1,3,6 Ayyalusamy Ramamoorthy,5 Nicholas A. Kotov1,6,7* Nanoscale building blocks are individually exceptionally strong because they are close to ideal, defect-free materials. It is, however, difficult to retain the ideal properties in macroscale composites. Bottom-up assembly of a clay/polymer nanocomposite allowed for the preparation of a homogeneous, optically transparent material with planar orientation of the alumosilicate nanosheets. The stiffness and tensile strength of these multilayer composites are one order of magnitude greater than those of analogous nanocomposites at a processing temperature that is much lower than those of ceramic or polymer materials with similar characteristics. A high level of ordering of the nanoscale building blocks, combined with dense covalent and hydrogen bonding and stiffening of the polymer chains, leads to highly effective load transfer between nanosheets and the polymer. 1 Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109–2136, USA. 2 Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109–2125, USA. 3 Program in Macromolecular Science and Engineering, University of Michigan, Ann Arbor, MI 48109–2140, USA. 4 Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109–2140, USA. 5 Biophysics Research Division and Department of Chemistry, University of Michigan, Ann Arbor, MI 48109–1055, USA. 6 Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109–2099, USA. 7 Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109–2136, USA. * To whom correspondence should be addressed. E-mail: kotov@umich.edu 全文链接： http://www.sciencemag.org/cgi/co ... ;resourcetype=HWCIT Supporting Online Material ： www.sciencemag.org/cgi/content/full/318/5847/80/DC1 Materials and Methods Figs. S1 to S10 References |
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