Hauptseite > Publikationsdatenbank > Dynamics in poly(n-alkyl methacrylates): A neutron scattering, calorimetric and dielectric study > print

001     10767
005     20240619091906.0
024 7 _ |2 DOI
|a 10.1021/ma902833h
024 7 _ |2 WOS
|a WOS:000275711300057
037 _ _ |a PreJuSER-10767
041 _ _ |a eng
082 _ _ |a 540
084 _ _ |2 WoS
|a Polymer Science
100 1 _ |0 P:(DE-HGF)0
|a Arbe, A.
|b 0
245 _ _ |a Dynamics in poly(n-alkyl methacrylates): A neutron scattering, calorimetric and dielectric study
260 _ _ |a Washington, DC
|b Soc.
|c 2010
300 _ _ |a 3107 - 3119
336 7 _ |a Journal Article
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336 7 _ |a article
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440 _ 0 |0 4142
|a Macromolecules
|v 43
|x 0024-9297
|y 6
500 _ _ |a We thank the Institut Laue-Langevin (ILL) in Grenoble (France) for neutron scattering facilities and the ILL scientists P. Fouqttet, M. Maccarini, B. Deme, and P. P. Deen for experimental help at the ILL. We are also thankful to Prof. A. Alegria for fruitful discussions. This research project has been supported by the European Commission NOE SoftComp, Contract NMP3-CT-2004-502235, the "Donostia International Physics Center". A.A. and J.C. acknowledge support from the projects MAT2007-63681, IT-436-07 (GV), and the Spanish Ministerio de Educacion y Ciencia (Grant CSD2006-53).
520 _ _ |a Combining neutron diffraction, neutron spin echo, differential scanning calorimetry, and dielectric spectroscopy, we have investigated the structure and dynamics of poly(n-butyl methacrylate) (PBMA) and poly(n-hexyl methacrylate) (PHMA). Signatures of the occurrence of a glass transition associated with the freezing of the intermolecular correlations within alkyl nanodomains are present in the structural data. Exploiting isotopic labeling, neutron scattering has revealed collective dynamics at the main-chain and side-group levels for both polymers and the self-motions of hydrogen atoms in the side groups of PHMA, adding valuable microscopic information to comprehensive relaxation maps and putting the relaxation results into a perspective. Moreover, we find exotic dynamical behavior for the side groups, characterized by extremely stretched (nearly logarithmic-like) decays of the correlation functions. For PHMA, a complete dynamical decoupling of side-group dynamics from the main-chain motions is found. The side groups of this polymer show an extremely "strong" temperature dependence of the structural relaxation time and much faster characteristic times for self than collective motions. The analogies found between the self-motions of the side-group H atoms in PHMA and the gamma-relaxation process in semicrystalline polyethylene (PE) strengthen the picture of confined PE-like dynamics within alkyl nanodomains. We discuss possible origins for the observed phenomenology.
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856 7 _ |u http://dx.doi.org/10.1021/ma902833h
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