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Título : Atomic motions in the ab-merging region of 1,4-polybutadiene: A molecular dynamics simulation study
Autor : Narros, Arturo; Arbe, Arantxa ; Álvarez González, Fernando ; Colmenero de León, Juan ; Richter, Dieter
Palabras clave : Diffusion
Molecular dynamics method
Polymers
Fecha de publicación : 11-jun-2008
Editor: American Institute of Physics
Citación : Journal of Chemical Physics 128, 224905 (2008).
Resumen: We present fully atomistic molecular dynamics simulations on 1,4-polybutadiene in a wide temperature range from 200 to 280 K, i.e., in the region where the α- and β-relaxations merge and above. A big computational effort has been performed —especially for the lowest temperatures investigated — to extend the simulation runs to very long times (up to 1 µs for 200 K). The simulated sample has been carefully validated by using previous neutron scattering data on the real sample with similar microstructure. Inspecting the trajectories of the different hydrogens in real space, we have observed a heterogeneous dynamical behavior (each kind of hydrogen moves in a different way) with signatures of combined hopping and diffusive motions in the whole range investigated. The application of a previously proposed model [Colmenero et al., Europhys. Lett. 71, 262 (2005)] is successful and a characterization of the local motions and diffusion is possible. The comparison of our results to those reported in the literature provides a consistent scenario for polybutadiene dynamics and puts into a context the different experimental observations. We also discuss the impact of the hopping processes on the observation and interpretation of experimentally accessible magnitudes and the origin of the deviations from Gaussian behavior in this system.
Descripción : 17 pp.-- PACS nrs.: 36.20.Ey, 36.20.Hb, 31.15.xv.
Versión del editor: http://dx.doi.org/10.1063/1.2937733
URI : http://hdl.handle.net/10261/7413
DOI: 10.1063/1.2937733
ISSN: 0021-9606
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