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Nanosilica/PMMA composites obtained by the modification of silica nanoparticles in a supercritical carbon dioxide-ethanol mixture

Authorized Users Only
2009
Authors
Stojanović, D.
Orlović, A.
Marković, Smilja
Radmilović, Velimir R.
Uskoković, Petar S.
Aleksić, Radoslav
Article (Published version)
Metadata
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Abstract
Nanosilica/poly(methyl methacrylate) (PMMA) composites are used to improve the mechanical properties of neat PMMA polymer. In order to obtain superior mechanical properties, it is essential to achieve good bonding between the SiO2 nanoparticles and the PMMA matrix, which is typically achieved by coating silica nanoparticles with silane coupling agents. In this study, conventional and supercritical coating methods were investigated together with their influence on the mechanical properties of the obtained nanosilica/PMMA composites. The results indicate advantageous properties of nanosilica modified in the supercritical phase of carbon dioxide and ethanol in terms of particle size distribution, amount of coated silane, and dispersion in the PMMA matrix. Careful dispersion of the starting silica nanoparticles in ethanol at low temperatures in order to obtain a nanosilica sol plays an important role in deagglomeration, dispersion, and the coating process. The resulting nanosilica/PMMA com...posite containing nanoparticles obtained by supercritical processing of the nanosilica sol showed an increase in hardness by 44.6% and elastic modulus by 25.7% relative to neat PMMA, as determined using the nanoindentation technique. The dynamic mechanical analysis reveals that addition of nanoparticles as nanosilica sol and nanosilica gel enhances composite storage modulus by about 54.3 and 46.5% at 40 °C. At the same temperature, incorporation of modified silica nanoparticles with conventional method leads to an increase of 15.9% for the storage modulus, probably due to a large silica particle size and lower silane content in this sample. © 2009 Springer Science+Business Media, LLC.

Keywords:
nanosilica/poly(methyl methacrylate) / PMMA / composite materials
Source:
Journal of Materials Science, 2009, 44, 23, 6223-6232
Publisher:
  • Springer

DOI: 10.1007/s10853-009-3842-8

ISSN: 0022-2461

WoS: 000270385100002

Scopus: 2-s2.0-70349652528
[ Google Scholar ]
53
49
URI
http://dais.sanu.ac.rs/123456789/3457
Collections
  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
Institution
Институт техничких наука САНУ / Institute of Technical Sciences of SASA
TY  - JOUR
AU  - Stojanović, D.
AU  - Orlović, A.
AU  - Marković, Smilja
AU  - Radmilović, Velimir R.
AU  - Uskoković, Petar S.
AU  - Aleksić, Radoslav
PY  - 2009
UR  - http://dais.sanu.ac.rs/123456789/3457
AB  - Nanosilica/poly(methyl methacrylate) (PMMA) composites are used to improve the mechanical properties of neat PMMA polymer. In order to obtain superior mechanical properties, it is essential to achieve good bonding between the SiO2 nanoparticles and the PMMA matrix, which is typically achieved by coating silica nanoparticles with silane coupling agents. In this study, conventional and supercritical coating methods were investigated together with their influence on the mechanical properties of the obtained nanosilica/PMMA composites. The results indicate advantageous properties of nanosilica modified in the supercritical phase of carbon dioxide and ethanol in terms of particle size distribution, amount of coated silane, and dispersion in the PMMA matrix. Careful dispersion of the starting silica nanoparticles in ethanol at low temperatures in order to obtain a nanosilica sol plays an important role in deagglomeration, dispersion, and the coating process. The resulting nanosilica/PMMA composite containing nanoparticles obtained by supercritical processing of the nanosilica sol showed an increase in hardness by 44.6% and elastic modulus by 25.7% relative to neat PMMA, as determined using the nanoindentation technique. The dynamic mechanical analysis reveals that addition of nanoparticles as nanosilica sol and nanosilica gel enhances composite storage modulus by about 54.3 and 46.5% at 40 °C. At the same temperature, incorporation of modified silica nanoparticles with conventional method leads to an increase of 15.9% for the storage modulus, probably due to a large silica particle size and lower silane content in this sample. © 2009 Springer Science+Business Media, LLC.
PB  - Springer
T2  - Journal of Materials Science
T1  - Nanosilica/PMMA composites obtained by the modification of silica nanoparticles in a supercritical carbon dioxide-ethanol mixture
SP  - 6223
EP  - 6232
VL  - 44
IS  - 23
DO  - 10.1007/s10853-009-3842-8
ER  - 
@article{
author = "Stojanović, D. and Orlović, A. and Marković, Smilja and Radmilović, Velimir R. and Uskoković, Petar S. and Aleksić, Radoslav",
year = "2009",
url = "http://dais.sanu.ac.rs/123456789/3457",
abstract = "Nanosilica/poly(methyl methacrylate) (PMMA) composites are used to improve the mechanical properties of neat PMMA polymer. In order to obtain superior mechanical properties, it is essential to achieve good bonding between the SiO2 nanoparticles and the PMMA matrix, which is typically achieved by coating silica nanoparticles with silane coupling agents. In this study, conventional and supercritical coating methods were investigated together with their influence on the mechanical properties of the obtained nanosilica/PMMA composites. The results indicate advantageous properties of nanosilica modified in the supercritical phase of carbon dioxide and ethanol in terms of particle size distribution, amount of coated silane, and dispersion in the PMMA matrix. Careful dispersion of the starting silica nanoparticles in ethanol at low temperatures in order to obtain a nanosilica sol plays an important role in deagglomeration, dispersion, and the coating process. The resulting nanosilica/PMMA composite containing nanoparticles obtained by supercritical processing of the nanosilica sol showed an increase in hardness by 44.6% and elastic modulus by 25.7% relative to neat PMMA, as determined using the nanoindentation technique. The dynamic mechanical analysis reveals that addition of nanoparticles as nanosilica sol and nanosilica gel enhances composite storage modulus by about 54.3 and 46.5% at 40 °C. At the same temperature, incorporation of modified silica nanoparticles with conventional method leads to an increase of 15.9% for the storage modulus, probably due to a large silica particle size and lower silane content in this sample. © 2009 Springer Science+Business Media, LLC.",
publisher = "Springer",
journal = "Journal of Materials Science",
title = "Nanosilica/PMMA composites obtained by the modification of silica nanoparticles in a supercritical carbon dioxide-ethanol mixture",
pages = "6223-6232",
volume = "44",
number = "23",
doi = "10.1007/s10853-009-3842-8"
}
Stojanović D, Orlović A, Marković S, Radmilović VR, Uskoković PS, Aleksić R. Nanosilica/PMMA composites obtained by the modification of silica nanoparticles in a supercritical carbon dioxide-ethanol mixture. Journal of Materials Science. 2009;44(23):6223-6232
Stojanović, D., Orlović, A., Marković, S., Radmilović, V. R., Uskoković, P. S.,& Aleksić, R. (2009). Nanosilica/PMMA composites obtained by the modification of silica nanoparticles in a supercritical carbon dioxide-ethanol mixture.
Journal of Materials ScienceSpringer., 44(23), 6223-6232. 
https://doi.org/10.1007/s10853-009-3842-8
Stojanović D., Orlović A., Marković Smilja, Radmilović Velimir R., Uskoković Petar S., Aleksić Radoslav, "Nanosilica/PMMA composites obtained by the modification of silica nanoparticles in a supercritical carbon dioxide-ethanol mixture" 44, no. 23 (2009):6223-6232,
https://doi.org/10.1007/s10853-009-3842-8 .

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