RT Journal Article
T1 The Effect of Surface Modification of Silica Microfillers in an Epoxy Matrix on the Thermo-mechanical Properties
A1 Olmos Díaz, Dania
A1 Baselga Llidó, Juan
A1 Mondragon, Iñaki
A1 González Benito, Francisco Javier
AB Thermo-mechanical and mechanical studies were carried out on silica filled epoxy composites. The effects of the filler with and without surfacemodification were studied. Silica particles were incorporated into the polymer matrix: (i) as received and (ii) surface treated with aminosilane coupling agents, namely 3-aminopropyltriethoxysilane (APTES) and 3-aminopropylmethyldiethoxysilane (APDES). The epoxy matrix consisted of poly (bisphenol A-co-epichlorohydrin) glycidyl end-capped (DGEBA) resin cured with ethylenediamine (EDA). The relaxation temperatures assigned to the glass transition temperatures (Tg) of the composites revealed that the filler both with and without surface treatment greatly affects the polymer network structure. It seems that on filling the epoxy-amine reactive mixture with silica a stoichiometric change in the epoxy/amine mixture occurs, which causes a decrease in the Tg. However, no significant differences were found for the different surface treatments. Assuming the systems were homogeneous a pseudo-fractional free volume was calculated from the superposition in the slow dynamics regime and good correlations between this parameter with the type of surface treatment and with the yield stress were found.
PB Koninklijke Brill NV
SN 0169-4243
YR 2008
FD 2008-07
LK https://hdl.handle.net/10016/26025
UL https://hdl.handle.net/10016/26025
LA eng
NO Authors gratefully acknowledge projects Nanoter (MAT2001347), Interfases (S-0505/MAT/0227) and MEC, Acciones Integradas (HH2006-0007) for financial support. Furthermore, the authors acknowledge the Universidad Carlos III de Madrid and the Universidad del País Vasco/Euskal Herriko Unibertsitatea for sup-porting Dr. J. González-Benito at the Departamento de Ingeniería Química y del M. Ambiente.
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RD 27 jul. 2024