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000836208 0247_ $$2doi$$a10.1103/PhysRevLett.119.047801
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000836208 0247_ $$2ISSN$$a1092-0145
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000836208 1001_ $$0P:(DE-Juel1)141629$$aMark, C.$$b0
000836208 245__ $$aPolymer Chain Conformation and Dynamical Confinement in a Model One-Component Nanocomposite
000836208 260__ $$aCollege Park, Md.$$bAPS$$c2017
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000836208 520__ $$aWe report a neutron-scattering investigation on the structure and dynamics of a single-component nanocomposite based on SiO2 particles that were grafted with polyisoprene chains at the entanglement limit. By skillful labeling, we access both the monomer density in the corona as well as the conformation of the grafted chains. While the corona profile follows a r−1 power law, the conformation of a grafted chain is identical to that of a chain in a reference melt, implying a high mutual penetration of the coronas from different particles. The brush crowding leads to topological confinement of the chain dynamics: (i) At local scales, the segmental dynamics is unchanged compared to the reference melt, while (ii) at the scale of the chain, the dynamics appears to be slowed down; (iii) by performing a mode analysis in terms of end-fixed Rouse chains, the slower dynamics is tracked to topological confinement within the cone spanned by the adjacent grafts; (iv) by adding 50% matrix chains, the topological confinement sensed by the grafted chain is lifted partially and the apparent chain motion is accelerated. We observe a crossover from pure Rouse motion at short times to topological confined motion beyond the time when the segmental mean squared displacement has reached the distance to the next graft.
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000836208 7001_ $$0P:(DE-Juel1)130718$$aHolderer, O.$$b1
000836208 7001_ $$0P:(DE-Juel1)130501$$aAllgaier, J.$$b2
000836208 7001_ $$0P:(DE-HGF)0$$aHübner, E.$$b3
000836208 7001_ $$0P:(DE-Juel1)130902$$aPyckhout-Hintzen, W.$$b4
000836208 7001_ $$0P:(DE-Juel1)131056$$aZamponi, M.$$b5
000836208 7001_ $$0P:(DE-Juel1)130905$$aRadulescu, A.$$b6
000836208 7001_ $$0P:(DE-Juel1)144382$$aFeoktystov, A.$$b7
000836208 7001_ $$0P:(DE-Juel1)130849$$aMonkenbusch, M.$$b8$$eCorresponding author
000836208 7001_ $$0P:(DE-Juel1)143752$$aJalarvo, N.$$b9
000836208 7001_ $$0P:(DE-Juel1)130917$$aRichter, D.$$b10
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