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024 7 _ |a 10.1039/c3sm51194d
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024 7 _ |a 1744-683X
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024 7 _ |a 1744-6848
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037 _ _ |a FZJ-2013-03994
082 _ _ |a 530
100 1 _ |a Glomann, Thomas
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245 _ _ |a A microscopic view on the large scale chain dynamics in nanocomposites with attractive interactions
260 _ _ |a Cambridge
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|b Royal Society of Chemistry (RSC)
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500 _ _ |a Creative Commons Licence CCBYNC
520 _ _ |a We use neutron spin-echo spectroscopy to investigate the large scale chain dynamics in unentangled polymer nanocomposites where stable polymer layers around nanoparticles are dynamically formed due to attractive segment–surface interactions. The work here focuses on the detailed microscopic characterization of the dynamics within these layers of bound poly(ethylene glycol) (PEO) and poly(butylene oxide) (PBO) chains at a fixed silica nanoparticle fraction of 15%. The substitution of hydroxy by methoxy terminated chains thereby clearly evidences the importance of the chain end chemistry in these systems as the layer structure and dynamics therein significantly depend on the specific interaction mechanism. The experimental data reveal a densely packed thick shell of end-attached chains in the case of hydroxy ends contrasted by a thin shell of laterally adsorbed chains with multiple attachments in the methoxy case. In all cases a consistent quantitative modeling is presented that evidences unchanged segmental dynamics within the bound layers. The obtained picture is further validated on an independent model system based on PBO polymers which shows surprisingly similar chain dynamics as for PEG in the nanocomposite pointing to a very generic dynamic scenario.
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650 1 7 |a Polymers, Soft Nano Particles and Proteins
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693 _ _ |a Forschungs-Neutronenquelle Heinz Maier-Leibnitz
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700 1 _ |a Hamm, Adrian
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700 1 _ |a Allgaier, Jürgen
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700 1 _ |a Hübner, Eike G.
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700 1 _ |a Radulescu, Aurel
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700 1 _ |a Farago, Bela
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700 1 _ |a Schneider, Gerald Johannes
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773 _ _ |a 10.1039/c3sm51194d
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856 4 _ |u http://pubs.rsc.org/en/content/articlelanding/2013/sm/c3sm51194d
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