Utilisation d'interactions non-covalentes dans le but de contrôlet l'auto-assemblage de copolymères à blocs
(2014)
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- For several years, the use of block copolymers in nanotechnology has been widely developed. These polymers can be used to obtain a wide range of nanostructured materials in the solid phase (thin films, for example) or in solution (micelles). An interesting method to modulate specific dimensions, morphology and properties of these nanostructures consists in using non-covalent interactions. Those interactions could either be formed between polymer blocks or between additives (salts, small organic molecules…) and one block of the copolymer. The resulting complexes are usually insoluble in the solvent used, and they can further aggregate into a micellar core stabilized by the uncomplexed block. In this work, we have studied the behaviour of two kinds of copolymers. The first ones, studied in water, are poly(vinylalcohol)-block-( poly(acrylic acid)-stat-poly(acrylamide)) (PVOH-b-(PAA-stat-PAM))and poly(vinylalcohol)-block-( poly(acrylic acid)-stat-poly(acrylamide))-block-poly(4-vinylpyridine) (PVOH-b-(PAA-stat-PAM)-b-P4VP). These polymers are particularly interesting since they can respond to multiple stimuli and moreover hydrogen bonds can be formed between the blocks depending on the environment. The influence of parameters such as the pH and the addition of Ca2+ ions, able to form complexes with the carboxylic acids of the PAA, on the self-assembly process has been studied. The second copolymers studied are the polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and poly(methylmethacrylate)-block-poly(methacrylic acid) (PMMA-b-PAA) and the PMMA-b-P4VP-b-PS triblock copolymer synthesized by ourselves. Two systems have been compared, a mix of the PMMA-b-PMAA and the PS-b-P4VP and another with the PMMA-b-P4VP-b-PS and a PAA homopolymer. For this work, the formation of hydrogen-bonded complexes between the P4VP and PMAA or PAA blocks has been investigated in organic solvents (THF and DMF). These interactions induce the formation of complexes which further aggregate into a micellar core surrounded by PS and PMMA chains.
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Guerlain, C. (2014). Utilisation d’interactions non-covalentes dans le but de contrôlet l’auto-assemblage de copolymères à blocs. https://hdl.handle.net/2078.5/54481