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001     839928
005     20210129231712.0
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100 1 _ |a Gold, Barbara
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245 _ _ |a Importance of Compact Random Walks for the Rheology of Transient Networks
260 _ _ |a Washington, DC
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520 _ _ |a Controlling the mechanical behavior of novel supramolecular materials is of the utmost importance and requires a fundamental understanding of the underlying physical processes. We present a multimethods approach to the dynamics of entangled transient polyisoprene networks. Small-angle neutron scattering (SANS) on randomly functionalized chains shows homogeneous supramolecular melts with Gaussian chain conformations. The H-bond lifetimes (dielectric α*-process) and the rheological response in terms of the loss modulus G″ differ by 2 orders of magnitude in time. Within the concept of a compact random walk (RW), where the random walker (urazole group acting as a sticker) undergoes multiple returns to its starting point and following the concept of theoretical proposed renormalized sticky bond lifetimes, we quantitatively solve this longstanding and unexplained large discrepancy: While the bond opening gives rise to the dielectric response, for rheological relaxation the association with a new partner is relevant. This takes place only after multiple returns to the original binding partner.
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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 Hövelmann, C. H.
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700 1 _ |a Lühmann, N.
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700 1 _ |a Szekely, Noemi
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700 1 _ |a Pyckhout-Hintzen, W.
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700 1 _ |a Wischnewski, A.
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700 1 _ |a Richter, D.
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773 _ _ |a 10.1021/acsmacrolett.6b00880
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