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  Correlated heterogeneous dynamics in glass-forming polymers

Conrad, H., Lehmkühler, F., Fischer, B., Westermeier, F., Schroer, M. A., Chushkin, Y., et al. (2015). Correlated heterogeneous dynamics in glass-forming polymers. Physical Review E, 91(4): 042309. doi:10.1103/PhysRevE.91.042309.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-3B57-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-3B58-D
Genre: Journal Article

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PhysRevE.91.042309.pdf (Publisher version), 595KB
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PhysRevE.91.042309.pdf
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2015
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http://dx.doi.org/10.1103/PhysRevE.91.042309 (Publisher version)
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 Creators:
Conrad, H.1, Author
Lehmkühler, F.1, 2, Author
Fischer, B.1, Author
Westermeier, Fabian1, 3, Author              
Schroer, M. A.1, 2, Author
Chushkin, Y.4, Author
Gutt, C.5, Author
Sprung, M.1, Author
Grübel, G.1, 2, Author
Affiliations:
1Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany, ou_persistent22              
2The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany, ou_persistent22              
3Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              
4European Synchrotron Radiation Facility, Avenue des Martyrs 71, 38000 Grenoble, France, ou_persistent22              
5University of Siegen, Walter-Flex Straße 3, 57072 Siegen, Germany, ou_persistent22              

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Free keywords: PACS numbers: 64.70.pj, 61.05.cf
 Abstract: We report x-ray photon correlation spectroscopy experiments on the dynamics of the glass-former polypropylene glycol covering a temperature range from room temperature to the glass transition at Tg = 205 K using silica tracer particles. Three temperature regimes are identified: At high temperatures, Brownian motion of the tracer particles is observed. Near Tg, the dynamics is hyperdiffusive and ballistic. Around 1.12Tg, we observe an intermediate regime. Here the stretching exponent of the Kohlrausch-Williams-Watts function becomes q dependent. By analyzing higher-order correlations in the scattering data, we find that dynamical heterogeneities dramatically increase in this intermediate-temperature regime. This leads to two effects: increasing heterogeneous dynamics and correlated motion at temperatures close to and below 1.12Tg.

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Language(s): eng - English
 Dates: 2015-01-142015-04-152015-04
 Publication Status: Published in print
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevE.91.042309
 Degree: -

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Title: Physical Review E
  Other : Phys. Rev. E
Source Genre: Journal
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Publ. Info: Melville, NY : American Physical Society
Pages: - Volume / Issue: 91 (4) Sequence Number: 042309 Start / End Page: - Identifier: ISSN: 1539-3755
CoNE: /journals/resource/954925225012