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Study of SiO2-filled polysiloxane system through dynamic rheological measurements : Untersuchung des SiO2-gefüllten Polysiloxanwerkstoffes mittels dynamischer rheologischer Messungen

In this study, two types of SiO2 nanoparticles with similar particle size and surface chemistry structure, i.e., SiO2 aerogels and colloidal SiO2 spheres were added into Poly(methylvinyl-siloxane (PMVS). The ultimate objective is to understand the effect of microstructure of nanoparticles on the dyn... Full description

Contained in: Journal of Materials Science Vol. 40, No. 1 (2005), p. 249-251
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Links: Additional Link (dx.doi.org)
Additional Keywords: AEROGEL
KOLLOIDALE-KIESELERDE
MESSEN-MECHANISCHER-GROESSEN
NANOPARTIKEL
RHEOLOGISCHE-EIGENSCHAFT
SILICIUMDIOXID
SILICON:POLYMER
SPEICHERMODUL
TRANSMISSIONSELEKTRONENMIKROSKOPIE
VERFORMUNG
DOI: 10.1007/s10853-005-5720-3
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 3 Seiten, 4 Bilder, 1 Tabelle, 8 Quellen
ID (e.g. DOI, URN): 10.1007/s10853-005-5720-3
PPN (Catalogue-ID): WTI042413419
Note: WTI TEMA DB
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520 |a In this study, two types of SiO2 nanoparticles with similar particle size and surface chemistry structure, i.e., SiO2 aerogels and colloidal SiO2 spheres were added into Poly(methylvinyl-siloxane (PMVS). The ultimate objective is to understand the effect of microstructure of nanoparticles on the dynamic rheological properties of PMVS/SiO2 system. The dynamic mechanical measurements were performed on a advanced rheometric expansion system. The strain sweep test was conducted with a frequency of 0.1rad.s-1 bei varying the strain from 0.01 to 100%. All tests were done in the linear viscoelastic region. The apparent decrease of storage modulus at critical strain amplitude was prominently enhanced upon increasing the surface structure from non-porous SiO2 spheres to porous SiO2 aerogels. It is predicted that to someextent the promoted filler networks result from the adsorption of PMVS chains onto the surface of silica nanoparticles, since the filler-filler interactions are considerably reduced by treatment with bis(3-triethoxysilylpropyl) tetrasulfane (TESPT). Furthermore, the destruction of filler network against deformation may involve in desorption of polymer chains from the SiO2 particles. 
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