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Título

Cluster glasses of semiflexible ring polymers

Autor Slimani, Mohammed Zakaria ; Bačová, Petra ; Bernabei, Marco; Narros, Arturo; Likos, Christos N.; Moreno Segurado, Ángel J.
Fecha de publicación 2014
EditorAmerican Chemical Society
Citación ACS Macro Letters 3(7): 611-616 (2014)
ResumenWe present computer simulations of concentrated solutions of unknotted nonconcatenated semiflexible ring polymers. Unlike in their flexible counterparts, shrinking involves a strong energetic penalty, favoring interpenetration and clustering of the rings. We investigate the slow dynamics of the centers-of-mass of the rings in the amorphous cluster phase, consisting of disordered columns of oblate rings penetrated by bundles of prolate ones. Scattering functions reveal a striking decoupling of self- and collective motions. Correlations between centers-of-mass exhibit slow relaxation, as expected for an incipient glass transition, indicating the dynamic arrest of the cluster positions. However, self-correlations decay at much shorter time scales. This feature is a manifestation of the fast, continuous exchange and diffusion of the individual rings over the matrix of clusters. Our results reveal a novel scenario of glass formation in a simple monodisperse system, characterized by self-collective decoupling, soft caging, and mild dynamic heterogeneity. © 2014 American Chemical Society.
Versión del editorhttp://dx.doi.org/10.1021/mz500117v
URI http://hdl.handle.net/10261/102588
DOI10.1021/mz500117v
Identificadoresdoi: 10.1021/mz500117v
e-issn: 2161-1653
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