[en] The effect of silica and polymer coated silica particles as reinforcing agents on the structural and mechanical properties of polystyrene-poly(ethylene/butylene)-polystyrene (PS-PEB-PS) triblock gel has been investigated. Different types of chemically modified silica have been compared in order to evaluate the influence of the compatibility between gel and filler. Time-resolved SANS and small-angle X-ray scattering (SAXS) shows that the presence of silica particles affects the ordering of the polystyrene domains during gelsetting. The scattering pattern of silica-reinforced gels reveals strong scattering at very low q, but no structure and formfactor information. However, on heating above the viscoelastic to plastic transition, the 'typical' scattering pattern of the copolymer gel builds-up. All reinforced gels are strengthened by the addition of the reinforcing agent. The transitions from a viscoclastic rubber to a plastic fluid and from a plastic fluid to a viscoelastic liquid are shifted to more elevated temperatures when silica is added to the triblock copolymer gel.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Theunissen, E.; Katholieke Universiteit Leuven (KUL) > Departement Scheikunde > Laboratorium voor Macromoleculaire Structuurchemie
Overbergh, N.
Reynaers, H.; Katholieke Universiteit Leuven (KUL) > Departement Scheikunde > Laboratorium voor Macromoleculaire Structuurchemie
Antoun, Said; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jérôme, Robert ; Université de Liège - ULiège > Centre d'études et de rech. sur les macromolécules (CERM)
Mortensen, K.; Danish Polymer Centre, Roskilde, Denmark
IWT - Agency for Innovation by Science and Technology FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen EU - European Union BELSPO - Service Public Fédéral de Programmation Politique scientifique
Commentary :
The authors acknowledge Polymer (Elsevier) for allowing them to archive this paper.
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