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The European Physical Journal E

, Volume 24, Issue 1, pp 69–77 | Cite as

The kinetics of the structural relaxation process in PHEMA-silica nanocomposites based on an equation for the configurational entropy

  • C. Théneau
  • M. Salmerón Sánchez
  • J. C. Rodrıguez Hernández
  • M. Monleón Pradas
  • J. M. Saiter
  • J. L. Gómez Ribelles
Regular Article

Abstract.

The enthalpy relaxation of polymer-silica nanocomposites prepared by simultaneous polymerization of poly(2-hydroxyethyl methacrylate) (PHEMA) and tetraethyloxysilane, TEOS, a silica precursor, is investigated. Both the glass transition temperature, Tg, and the temperature interval of the glass transition, ΔT g , increase as the silica content in the sample does. Structural relaxation experiments show that the temperature interval in which conformational motions take place broadens as the silica content in the hybrid increases. A phenomenological model based on the evolution of the configurational entropy during the structural relaxation process, the SC model, has been used for determining the temperature dependence of the relaxation times during the process. The results show an increase of the fragility of the polymer as the silica content increases, a feature that can be related to the broadening of the distribution of relaxation times characterized by the β parameter of the stretched exponential distribution. On another hand the silica content increase produces a significant change of the relaxation times in the glassy state.

PACS.

64.70.Pf Glass transitions 65.40.Gr Entropy and other thermodynamical quantities 81.07.Pr Organic-inorganic hybrid nanostructures 

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Copyright information

© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  • C. Théneau
    • 1
    • 2
  • M. Salmerón Sánchez
    • 1
    • 3
  • J. C. Rodrıguez Hernández
    • 1
  • M. Monleón Pradas
    • 1
    • 3
  • J. M. Saiter
    • 2
  • J. L. Gómez Ribelles
    • 1
    • 3
  1. 1.Center for BiomaterialsUniversidad Politécnica de ValenciaValenciaSpain
  2. 2.Laboratoire d'Etude et Caractérisation des Amorphes et des PolymèresUniversité de RouenRouenFrance
  3. 3.Centro de Investigación Prıncipe FelipeValenciaSpain

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