Article (Scientific journals)
Mobility restrictions and glass transition behaviour of an epoxy resin under confinement
Djemour, A.; Sanctuary, Roland; Baller, Jörg
2015In Soft Matter, 11 (13), p. 2683-2690
Peer reviewed
 

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Mobility restrictions and glass transition behaviorbehaviour of an epoxy resin under confinement. Djemour, Sanctuary, Baller.pdf
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Abstract :
[en] Confinement can have a big influence on the dynamics of glass formers in the vicinity of the glass transition. Already 40 to 50 K above the glass transition temperature, thermal equilibration of glass formers can be strongly influenced by the confining substrate. We investigate the linear thermal expansion and the specific heat capacity c(p) of an epoxy resin (diglycidyl ether of bisphenol A, DGEBA) in a temperature interval of 120 K around the glass transition temperature. The epoxy resin is filled into controlled pore glasses with pore diameters between 4 and 111 nm. Since DGEBA can form H-bonds with silica surfaces, we also investigate the influence of surface silanization of the porous substrates. In untreated substrates a core/shell structure of the epoxy resin can be identified. The glass transition behaviours of the bulk phase and that of the shell phase are different. In silanized substrates, the shell phase disappears. At a temperature well above the glass transition, a second transition is found for the bulk phase - both in the linear expansion data as well as in the specific heat capacity. The c(p) data do not allow excluding the glass transition of a third phase as being the cause for this transition, whereas the linear expansion data do so. The additional transition temperature is interpreted as a separation between two regimes: above this temperature, macroscopic flow of the bulk phase inside the porous structure is possible to balance the mismatch of thermal expansion coefficients between DGEBA and the substrate. Below the transition temperature, this degree of freedom is hindered by geometrical constraints of the porous substrates. Moreover, this second transition could also be found in the linear expansion data of the shell phase.
Disciplines :
Physics
Author, co-author :
Djemour, A.
Sanctuary, Roland ;  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
External co-authors :
no
Language :
English
Title :
Mobility restrictions and glass transition behaviour of an epoxy resin under confinement
Publication date :
2015
Journal title :
Soft Matter
ISSN :
1744-683X
Volume :
11
Issue :
13
Pages :
2683-2690
Peer reviewed :
Peer reviewed
Additional URL :
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