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PRL 懸濁液模型研究玻璃轉(zhuǎn)變
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Nanoparticle Motion within Glassy Polymer Melts Phys. Rev. Lett. 102, 075702 (2009) [4 pages] Hongyu Guo,1 Gilles Bourret,2 Muriel K. Corbierre,2 Simona Rucareanu,2 R. Bruce Lennox,2 Khalid Laaziri,3 Luc Piche,3 Mark Sutton,3 James L. Harden,4 and Robert L. Leheny1 1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA 2Department of Chemistry, McGill University, Montréal, Québec H3A 2K6, Canada 3Department of Physics, McGill University, Montréal, Québec H3A 2K6, Canada 4Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada Received 16 July 2008; published 20 February 2009 X-ray photon correlation spectroscopy is employed to investigate the motion of dilute suspensions of gold nanoparticles in low-molecular-weight polystyrene melts. At high temperatures, the observed motion is diffusive, with a rate that follows a Vogel-Fulcher temperature dependence. Closer to the glass transition temperature Tg, diffusion is superseded by a hyperdiffusive process that first becomes observable near a crossover temperature Tc1.1Tg and is identified with heterogeneous strain in the melts. Following rapid cooling to temperatures sufficiently below Tc, but still above Tg, the hyperdiffusive dynamics displays a time dependence similar to aging in polymer glasses. ©2009 The American Physical Society http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000102000007075702000001&idtype=cvips&gifs=yes [ Last edited by hslining on 2009-9-10 at 15:12 ] |
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