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Matériaux nanostructurés obtenus par combinaison de polymérisation radicalaire contrôlée et de mélangeage réactif

Abstract : Nanostructured blends of methacrylic copolymers and polyamide 6 were obtained by reactive blending. The grafting reaction occurs between the amine end of the polyamide and the reactive units (acid or anhydride) of the methacrylic backbone. The distribution of the reactive units along the backbone has an influence on the nanostructure and properties of these materials. To understand this effect, we synthesized well-defined butyl methacrylate copolymers by controlled radical polymerization (ATRP). The polymerization reaction was monitored /in situ/ by near infrared spectroscopy allowing a real-time estimation of the chain length. With this methodology, we obtained series of copolymers having similar molar masses, low polydispersities and controlled distribution of reactive units (methacrylic acid). The reactive units are distributed all along the backbone (monoblock architecture), on a part of the chain (diblock) or at the two ends of the chain (triblock). The grafting of polyamide on these backbones was achieved in melt in an extruder. The morphology of the resulting materials was studied by transmission electron microscopy (TEM), mechanical properties by dynamic mechanical analysis (DMA), the crystallization by differential scanning calorimetry (DSC) and the solvent resistance by solubility tests. The grafting efficiency of polyamide on the backbone is very high (up to 90%) and increases with the density of reactive sites. The distribution of reactive sites, or of polyamide grafts, strongly influences the nanostructure and the properties of blends. It is therefore possible to obtain the desired morphology and properties by choosing the backbone architecture. The results of this study were used to prepare nanostructured materials from elastomeric tribloc backbones: PMMA-b-PBA-b-PMMA and PS-b-PBA-b-PS. We obtain high performance thermoplastic elastomers: transparent, resistant to solvents and with good mechanical properties up to 200°C.
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Submitted on : Tuesday, November 10, 2009 - 11:30:54 AM
Last modification on : Tuesday, December 14, 2021 - 3:16:33 AM
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  • HAL Id : tel-00430883, version 1


Séverin Dronet. Matériaux nanostructurés obtenus par combinaison de polymérisation radicalaire contrôlée et de mélangeage réactif. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00430883⟩



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