We have studied by inelastic x-ray scattering, at wave vectors 1 nm(-1)<= q <= 15 nm(-1), the high-frequency dynamics of epoxy-amine mixtures as the monomers irreversibly polymerize. We find that chemical bonding, while inducing molecular ordering on a mesoscopic length scale, also efficiently realizes the mechanism of dynamical arrest described by the mode-coupling theory, as manifested by a cusp singularity in the behavior of the nonergodicity factor as a function of the number of chemical bonds. These results confront positively the mode-coupling theory with a new control parameter.

Bond-Induced Ergodicity Breakdown in Reactive Mixtures

COREZZI, Silvia
;
COMEZ, Lucia;FIORETTO, Daniele;
2006

Abstract

We have studied by inelastic x-ray scattering, at wave vectors 1 nm(-1)<= q <= 15 nm(-1), the high-frequency dynamics of epoxy-amine mixtures as the monomers irreversibly polymerize. We find that chemical bonding, while inducing molecular ordering on a mesoscopic length scale, also efficiently realizes the mechanism of dynamical arrest described by the mode-coupling theory, as manifested by a cusp singularity in the behavior of the nonergodicity factor as a function of the number of chemical bonds. These results confront positively the mode-coupling theory with a new control parameter.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11391/155084
Citazioni
  • ???jsp.display-item.citation.pmc??? 2
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 12
social impact