Hydrogen bonded supramolecular polymers in protic solvents: role of multitopicity
Résumé
We describe the synthesis of macromolecular amphiphiles of various molar masses containing well-defined hydrophobic groups incorporating urea moieties. All compounds have the same proportion of associative hydrophobic groups and solubilising POE chains. However, a strong influence of both 10the number of associative groups per chain and its polydispersity is demonstrated. In water, where the interactions between stickers are strong, the monomer (bearing a single sticker) self-assembles into filaments, but all other compounds with more than one sticker per chain are 15insoluble. In methanol, where the interactions between stickers are weaker, neither the monomer nor the monodispersed dimer are assembled, whereas polydispersed chains with an average number of stickers per chain of 2 or 3 self-assemble into filaments, leading to macroscopic gelation.
Domaines
Chimie
Origine : Fichiers produits par l'(les) auteur(s)
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