Article (Scientific journals)
Strain-induced low-frequency relaxation in colloidal DGEBA/SiO2 suspensions
Dannert, Rick; Sanctuary, Roland; Thomassey, M. et al.
2014In Rheologica Acta, 53 (9), p. 715-723
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Keywords :
Rheology Brownian motion Colloidal suspension Nanoparticles Low-molecular-weight glass former Relaxation process linear viscoelastic behavior mechanical-properties glass-transition epoxy composites silica polymers nanocomposites dispersions emulsion rheology
Abstract :
[en] Diglycidyl ether of bisphenol A (DGEBA) is widely exploited as an epoxy resin in adhesives and coatings. In this paper, it is used as an oligomer matrix for silica-filled nanocomposites. Rheological measurements show that the pure matrix obeys power-law relaxation dynamics in the vicinity of the dynamic glass transition of this low-molecular-weight glass former. In the filled systems, a low-frequency relaxation appears additionally to the structural alpha-process of the matrix. Considering the nanocomposites as Newtonian hard-sphere suspensions at low angular frequencies (or high temperatures), the modified terminal regime behavior of the matrix can be linked to strain-induced perturbations of the isotropic filler distributions. While in the low-frequency regime hydrodynamic stresses relax instantaneously, the Brownian stress relaxation is viscoelastic and can be evidenced by dynamic rheological measurements. At higher angular frequencies, the alpha-process of the matrix superimposes on the Brownian stress relaxation. In particular, we were able to depict the low-frequency anomaly for concentrated, semi-dilute, and even for dilute suspensions.
Disciplines :
Physics
Author, co-author :
Dannert, Rick ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Sanctuary, Roland ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Thomassey, M.
Elens, P.
Krüger, Jan-Kristian ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Baller, Jörg ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Title :
Strain-induced low-frequency relaxation in colloidal DGEBA/SiO2 suspensions
Publication date :
2014
Journal title :
Rheologica Acta
ISSN :
0035-4511
Publisher :
Springer, Germany
Volume :
53
Issue :
9
Pages :
715-723
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 03 October 2014

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