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Theses

Nanocomposites polyméthacrylate de méthyle - silicates lamellaires.
Influence de la nature de la charge et de l'interface sur les propriétés mécaniques et sur la transition vitreuse.

Abstract : Various PMMA-silicate nanocomposites have been prepared by polymerizing in situ a dispersion of lamellar nanosilicate filler particles in methyl methacrylate. The role of the filler nature and the filler-matrix interface on both glass transition and plasticity was investigated by incorporating various types of inorganic fillers and tailoring the interface. Two phyllosilicate clays (cloisite and laponite) and two hybrid calcium silicates were used. The strength of the nanosilicate-matrix coupling was tailored in order to have either strong or weak coupling. Strong coupling was obtained by forming a covalent bound, whereas weak coupling was obtained by using an ion-exchanged coupling agent interacting by van der Waals forces with the matrix. The clays were pre-treated by cation exchange with ammoniums ions linked to one or two alkyl chains with (strong coupling) or without (weak coupling) a double bond end group able to react with methyl methacrylate. On the other hand, the hybrid calcium silicates nanoparticles were synthesized with vinyl groups bound on their surface (strong coupling). For each type of pre-treatment, the procedure was optimized in order to obtain the better fillers dispersion in the nanocomposites. X-ray diffraction and transmission electron microscopy were used to control the state of dispersion. Dynamical mechanical measurements show that the incorporation of lamellar nanoparticles in a thermoplastic matrix can lead to either an increase or to a reduction of the glass transition temperature. This variation seems to be better related to the nature of the interface than to the filler particles size.In all samples, the study of plasticity reveals a reinforcing effect which, however, remains lower than those observed with other types of nanocomposites based on a thermoplastic matrix.
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https://tel.archives-ouvertes.fr/tel-00011269
Contributor : Patrick Amarelis <>
Submitted on : Friday, December 30, 2005 - 12:33:07 PM
Last modification on : Thursday, December 10, 2020 - 12:33:01 PM
Long-term archiving on: : Saturday, April 3, 2010 - 7:55:32 PM

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  • HAL Id : tel-00011269, version 1

Citation

Patrick Amarelis. Nanocomposites polyméthacrylate de méthyle - silicates lamellaires.
Influence de la nature de la charge et de l'interface sur les propriétés mécaniques et sur la transition vitreuse.. Matériaux. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00011269⟩

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