M. Monkenbusch

Forschungszentrum Jülich

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Dieter Richter

Forschungszentrum Jülich

167

Olaf Holderer

Forschungszentrum Jülich

Jürgen Allgaier

Forschungszentrum Jülich

Juan Colmenero

Donostia International Physics Center

Arantxa Arbe

Material Physics Center

B. Farago

Institut Laue-Langevin

Lutz Willner

Forschungszentrum Jülich

Michaela Zamponi

Forschungszentrum Jülich

A. Wischnewski

Forschungszentrum Jülich

Michael Ohl

Forschungszentrum Jülich

Cooperative Institutions

Forschungszentrum Jülich

173

Institut Laue-Langevin

Centre National de la Recherche Scientifique

Heinz Maier-Leibnitz Zentrum

Oak Ridge National Laboratory

Stadtwerke Jülich (Germany)

RWTH Aachen University

Technical University of Munich

Institut Langevin

Max Planck Computing and Data Facility

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Molecular observation of contour length fluctuations in polymer melts

Physica B Condensed Matter (2004)

A. Wischnewski Michaela Zamponi M. Monkenbusch Lutz Willner Wim Pyckhout‐Hintzen

Reptation

Chain (unit)

Length scale

10.1016/j.physb.2004.04.024

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Citations (1)

Origin of Internal Viscosity Effects in Flexible Polymers: A Comparative Neutron Spin-Echo and Light Scattering Study on Poly(dimethylsiloxane) and Polyisobutylene

Macromolecules (2001)

Arantxa Arbe M. Monkenbusch Jörg Stellbrink Dieter Richter B. Farago

We present a comparative neutron spin-echo and dynamic light scattering study of the chain dynamics of the dynamically very flexible poly(dimethylsiloxane) (PDMS) with the orientationally hindered polyisobutylene (PIB). Both polymers exhibit the same static rigidity. In the melt PDMS follows the Rouse dynamics up to momentum transfers of Q = 0.4 Å-1, while PIB displays a strong influence of local dynamics already above Q = 0.15 Å-1. In dilute solution the dynamic structure factors and the diffusion coefficients of both polymers were studied over a wide temperature and Q range. A comparative evaluation of the PIB intrachain dynamics on the basis of PDMS results, which are taken to reflect as in the melt "ideal" relaxations, shows that intrachain viscosity effects are the leading mechanism displayed by the Rouse and Zimm models. The characteristic relaxation time of the intrachain viscosity τ0 agrees well with the rotational barriers in PIB, corroborating the underlying physical idea of a delayed redistribution of conformational states to be at the origin of internal viscosity effects.

Neutron spin echo

Chemical solution

10.1021/ma001628x

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Citations (62)

Diffusion of phosphoric acid in polymer electrolyte membranes

Oxana Ivanova Olaf Holderer M. Monkenbusch Reiner Zorn Bernhard Hopfenmüller

Phosphoric acid

Polymer Electrolytes

Source

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Citations (0)

Direct observation of the transition from free to constrained single segment motion in entangled polymer melts

Physica B Condensed Matter (2004)

M. Monkenbusch A. Wischnewski Lutz Willner Dieter Richter

Reptation

Neutron spin echo

Mean squared displacement

10.1016/j.physb.2004.04.030

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Citations (3)

The combination of neutron spin echo and dielectric spectroscopy to examine tube dilation

EPJ Web of Conferences (2022)

Paula Malo de Molina Ángel Alegría Jürgen Allgaier Margarita Kruteva Ingo Hoffmann

The polymer dynamics in blends of long and short chains spans several decades in time and the understanding of the effect of the short chains on the relaxation mechanism of the long chains due to constraint release requires the combination of microscopic and macroscopic techniques. While the longtime dynamics can be accessed by mechanical or dielectric spectroscopy (DS), its relation to the microstructural details requires the application of theoretical models. In contrast, neutron spin echo (NSE) measures directly the dynamic structure factor reflecting the process of constraint removal at the molecular scale. Here the comparison of NSE and DS results in a model blend of short and long polyisoprene enables the exploration of the entire time regime showing that constraint release leads to a dilation of the confining tube. We show the description of the dynamic tube dilation using a simple model in which the time controlling the tube dilation for the long chain is the terminal time of the short chain.

Neutron spin echo

Dilation (metric space)

Neutron spectroscopy

10.1051/epjconf/202227201001

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Citations (0)

Observing proton motion in polymeric electrolyte membranes

Bernhard Hopfenmüller Oxana Ivanova Olaf Holderer Reiner Zorn G. Ehlers

Source

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Response to “Comment on ‘From Rouse dynamics to local relaxation: A neutron spin echo study on polyisobutylene melts’ ” [J. Chem. Phys. 113, 11396 (2000)]

The Journal of Chemical Physics (2000)

Dieter Richter M. Monkenbusch Wim Pyckhout‐Hintzen Arantxa Arbe Juan Colmenero

It is shown that the large deviations of the intermediate scattering function S(Q,t) from the prediction of the Rosue model as observed for polyisobutylene (PIB) chains in the melt cannot be explained by the stiff chain model. By presenting new data on polydimethylsiloxane with the same structural parameters but low internal barriers which follow the Rouse prediction over the full Q-range, the conclusion is reached that the PIB dynamics is slowed down by internal friction.

Neutron spin echo

Dynamics

Polydimethylsiloxane

10.1063/1.1326919

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Citations (8)

Packing and state of order in conducting polymers. The structure of [(CH)(SbF₆)_0,06]_x

Die Makromolekulare Chemie Rapid Communications (1985)

Gerhard Wieners R. Weizenhöfer M. Monkenbusch Manfred Stamm Günter Lieser

10.1002/marc.1985.030060610

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Citations (21)