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Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods

Authorized Users Only
2018
Authors
Tomić, Miloš
Dunjic, Branko
Nikolić, Marija S.
Maletaškić, Jelena
Pavlović, Vladimir B.
Bajat, Jelena B.
Đonlagić, Jasna A.
Article
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Abstract
The major aims of this paper are the investigation of the effects of the mixing procedure and the montmorillonite (Mt) surface modification on the structure (optical microscopy, XRD, TEM, SEM), rheological, mechanical properties (DMA, tensile test) and corrosion stability (electrochemical impedance spectroscopy) of clay mineral/epoxy nanocomposite (CPN). Two series of CPN samples were prepared based on diglycidyl ether of bisphenol A (DGEBA) and polyamidoamine curing agent with three organophilic Mt and sodium-montmorillonite (1 wt%). Mt were mixed with DGEBA solution in the powder (direct mixing) and in the form of dispersions, preswollen in a commercial coating thinner (solution intercalation). The commercial Mt (Cloisite 30B) modified by quaternary alkylammonium ions bearing hydroxyl groups and especially Mt functionalized by primary (HDA(+)-Mt) alkylammonium ions, at loadings close to cation exchange capacity (CRC), were significantly swollen by thinner and further uniformly disper...sed into CPN. Meanwhile, low gel volumes in thinner were found for more hydrophobic Mt (Cloisite 15A). The compatibility of Mt with solvents was well described by solubility and Flory-Huggins interaction parameters. In contrast to the direct incorporation of Mt powders in CPN, swelling enhanced intercalation of epoxy matrix into Mt, and for HDA(+)-Mt based CPN interlayer spacing reached 4.4 nm. The usage of HDA(+)-Mt organoclay and solution intercalation procedure provided the highest enhancement in rheological parameters (G, G, of Mt/epoxy dispersions and glassy storage modulus, Youngs modulus and barrier properties of cured CPN.

Keywords:
Montmorillonite / Swelling / Epoxy nanocomposites / Dispersion
Source:
Applied Clay Science, 2018, 154, 52-63
Funding / projects:
  • Synthesis, processing and characterization of nanostructured materials for application in the field of energy, mechanical engineering, environmental protection and biomedicine (RS-45012)
  • Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (RS-45019)
  • Synthesis and characterization of novel functional polymers and polymeric nanocomposites (RS-172062)

DOI: 10.1016/j.clay.2017.12.047

ISSN: 0169-1317; 1872-9053

WoS: 000424722900007

Scopus: 2-s2.0-85040594572
[ Google Scholar ]
18
9
URI
https://vinar.vin.bg.ac.rs/handle/123456789/1951
Collections
  • WoS Import
Institution/Community
Vinča
TY  - JOUR
AU  - Tomić, Miloš
AU  - Dunjic, Branko
AU  - Nikolić, Marija S.
AU  - Maletaškić, Jelena
AU  - Pavlović, Vladimir B.
AU  - Bajat, Jelena B.
AU  - Đonlagić, Jasna A.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1951
AB  - The major aims of this paper are the investigation of the effects of the mixing procedure and the montmorillonite (Mt) surface modification on the structure (optical microscopy, XRD, TEM, SEM), rheological, mechanical properties (DMA, tensile test) and corrosion stability (electrochemical impedance spectroscopy) of clay mineral/epoxy nanocomposite (CPN). Two series of CPN samples were prepared based on diglycidyl ether of bisphenol A (DGEBA) and polyamidoamine curing agent with three organophilic Mt and sodium-montmorillonite (1 wt%). Mt were mixed with DGEBA solution in the powder (direct mixing) and in the form of dispersions, preswollen in a commercial coating thinner (solution intercalation). The commercial Mt (Cloisite 30B) modified by quaternary alkylammonium ions bearing hydroxyl groups and especially Mt functionalized by primary (HDA(+)-Mt) alkylammonium ions, at loadings close to cation exchange capacity (CRC), were significantly swollen by thinner and further uniformly dispersed into CPN. Meanwhile, low gel volumes in thinner were found for more hydrophobic Mt (Cloisite 15A). The compatibility of Mt with solvents was well described by solubility and Flory-Huggins interaction parameters. In contrast to the direct incorporation of Mt powders in CPN, swelling enhanced intercalation of epoxy matrix into Mt, and for HDA(+)-Mt based CPN interlayer spacing reached 4.4 nm. The usage of HDA(+)-Mt organoclay and solution intercalation procedure provided the highest enhancement in rheological parameters (G, G, of Mt/epoxy dispersions and glassy storage modulus, Youngs modulus and barrier properties of cured CPN.
T2  - Applied Clay Science
T1  - Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods
VL  - 154
SP  - 52
EP  - 63
DO  - 10.1016/j.clay.2017.12.047
ER  - 
@article{
author = "Tomić, Miloš and Dunjic, Branko and Nikolić, Marija S. and Maletaškić, Jelena and Pavlović, Vladimir B. and Bajat, Jelena B. and Đonlagić, Jasna A.",
year = "2018",
abstract = "The major aims of this paper are the investigation of the effects of the mixing procedure and the montmorillonite (Mt) surface modification on the structure (optical microscopy, XRD, TEM, SEM), rheological, mechanical properties (DMA, tensile test) and corrosion stability (electrochemical impedance spectroscopy) of clay mineral/epoxy nanocomposite (CPN). Two series of CPN samples were prepared based on diglycidyl ether of bisphenol A (DGEBA) and polyamidoamine curing agent with three organophilic Mt and sodium-montmorillonite (1 wt%). Mt were mixed with DGEBA solution in the powder (direct mixing) and in the form of dispersions, preswollen in a commercial coating thinner (solution intercalation). The commercial Mt (Cloisite 30B) modified by quaternary alkylammonium ions bearing hydroxyl groups and especially Mt functionalized by primary (HDA(+)-Mt) alkylammonium ions, at loadings close to cation exchange capacity (CRC), were significantly swollen by thinner and further uniformly dispersed into CPN. Meanwhile, low gel volumes in thinner were found for more hydrophobic Mt (Cloisite 15A). The compatibility of Mt with solvents was well described by solubility and Flory-Huggins interaction parameters. In contrast to the direct incorporation of Mt powders in CPN, swelling enhanced intercalation of epoxy matrix into Mt, and for HDA(+)-Mt based CPN interlayer spacing reached 4.4 nm. The usage of HDA(+)-Mt organoclay and solution intercalation procedure provided the highest enhancement in rheological parameters (G, G, of Mt/epoxy dispersions and glassy storage modulus, Youngs modulus and barrier properties of cured CPN.",
journal = "Applied Clay Science",
title = "Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods",
volume = "154",
pages = "52-63",
doi = "10.1016/j.clay.2017.12.047"
}
Tomić, M., Dunjic, B., Nikolić, M. S., Maletaškić, J., Pavlović, V. B., Bajat, J. B.,& Đonlagić, J. A.. (2018). Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods. in Applied Clay Science, 154, 52-63.
https://doi.org/10.1016/j.clay.2017.12.047
Tomić M, Dunjic B, Nikolić MS, Maletaškić J, Pavlović VB, Bajat JB, Đonlagić JA. Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods. in Applied Clay Science. 2018;154:52-63.
doi:10.1016/j.clay.2017.12.047 .
Tomić, Miloš, Dunjic, Branko, Nikolić, Marija S., Maletaškić, Jelena, Pavlović, Vladimir B., Bajat, Jelena B., Đonlagić, Jasna A., "Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods" in Applied Clay Science, 154 (2018):52-63,
https://doi.org/10.1016/j.clay.2017.12.047 . .

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