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Theses

Etude d'un procédé d'élaboration et caractérisation de nanocomposites à base de polypropylène et de montmorillonite :

Abstract : This work dealt with polypropylene/organically modified montmorillonite (PP/o-MMT) nanocomposites. The main objective was to study the efficiency of using an acrylic acid modified PP (PP-g-AA) as a compatibilizer to promote the intercalation and/or exfoliation of the o-MMT in the PP, on the one hand; and the structures and properties of the resulting composites, on the other hand. Two kinds of PP-g-AA having the same acrylic acid content (6 wt.%) and differing in molar mass were used. The o-MMT content was 0, 1, or 5 wt.% and the PP-g-AA/o-MMT mass ratio was 0:1, 1:1, 2:1 or 5:1. X-ray diffraction and transmission electronic microscopy showed that without PP-g-AA, the structure of the PP/o-MMT was like that of a conventional micro-composite. With PP-g-AA, the o-MMT was intercalated. Compared to the neat PP, the PP/o-MMT showed an increase in thermal stability of up to 40ÊC and 30% in elastic modulus. However this increase was concomitant to a decrease in impact strength as the compatibilizer/montmorilonite mass ratio increased. Incorporation of the o-MMT in the PP always led to a decrease in CO2 permeability and the degree of decrease was more significant for compatibilized PP/o-MMT composites (better intercalation/exfoliation) reaching up to 50% with respect to the virgin PP. Based on the above results, it was concluded that the PP-g-AA was efficient to promote the intercalation/exfoliation of the o-MMT in the PP. However, there seemed no significant differences between the two PP-g-AA compatibilizers. Overall, for both PP-g-AA, better properties were obtained for higher PP-g-AA/o-MMT mass ratio
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Anne Cristine Chinellato. Etude d'un procédé d'élaboration et caractérisation de nanocomposites à base de polypropylène et de montmorillonite :. Autre. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL093N⟩. ⟨tel-01752519⟩

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