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Functionalization of synthetic talc-like phyllosilicates by alkoxyorganosilane grafting

Chabrol, Karine and Gressier, Marie and Pébère, Nadine and Menu, Marie-Joëlle and Martin, François and Bonino, Jean-Pierre and Marichal, Claire and Brendlé, Jocelyne Functionalization of synthetic talc-like phyllosilicates by alkoxyorganosilane grafting. (2010) Journal of Materials Chemistry, vol. 20 (n° 43). pp. 9695-9706. ISSN 0959-9428

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Official URL: http://dx.doi.org/10.1039/C0JM01276A

Abstract

A range of talc-like phyllosilicates were prepared via a hydrothermal synthesis performed at five different temperatures from 160 to 350 °C. The organization of the lattice and the degree of crystallinity of the new materials were evaluated by different techniques such as XRD, FTIR, solid-state 29Si NMR, TEM, FEG-SEM and TG-DTA. When synthesized at low temperature the material presents high degree of hydration, low crystallinity and flawed structure. This was attributed to stevensite-talc interstratified product present in the samples. The stevensite/talc ratio and the hydration decrease in the talc-like phyllosilicate samples when the hydrothermal synthesis temperature increases and so the crystallinity becomes higher. A thermal treatment at 500 °C allowed a significant flaw reduction in talc-like phyllosilicate structure; the synthesized sample at 350 °C and heat treated presents a structure close to that of talc. The different talc-like phyllosilicates were grafted covalently by two organoalkoxysilane reagents, N-(3-triethoxysilylpropyl)-4,5-dihydroimidazole (IM2H) and 2-hydroxy-4-(3-triethoxysilylpropoxy)-diphenylketone (HTDK). The grafted amounts of the hybrids, determined by elemental analysis and confirmed by thermogravimetric data, are dependent on the hydrothermal synthesis temperature and organoalkoxysilanes; they become smaller when the synthesis temperature increases and when HTDK is used. FTIR and solid-state 13C CP MAS NMR were applied to characterize the grafted organic groups. So, in this work it is shown that by choosing the hydrothermal synthesis temperature or by performing an additional annealing it is possible to adjust the amount of defects in the structure of talc-like phyllosilicates which seems to be strongly correlated to the grafting performance.

Item Type:Article
Additional Information:Thanks to Royal Society of Chemistry. The definitive version is available at http://pubs.rsc.org/.The original PDF of the article can be found at Journal of Materials Chemistry website : http://pubs.rsc.org/en/journals/journalissues/jm
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National des Etudes Spatiales - CNES
French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
French research institutions > Institut de Recherche pour le Développement - IRD
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université de Haute Alsace - UHA (FRANCE)
Laboratory name:
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Deposited By: Leila Abdelouhab

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