Fibrillar structure of self-assemblies formed from heterocomplementary monomers linked through sextuple hydrogen-bonding arrays
Fiche publication
Date publication
janvier 2007
Auteurs
Membres identifiés du Cancéropôle Est :
Pr LEHN Jean-Marie
Tous les auteurs :
Buhler E, Candau SJ, Schmidt J, Talmon Y, Kolomiets E, Lehn JM
Lien Pubmed
Résumé
The nanostructure of the fibrillar supramolecular aggregates generated in decane solutions of homoditopic heterocomplementary monomers forming sextuple hydrogen-bond-mediated self-assemblies was investigated by small-angle neutron scattering and cryogenic-temperature transmission electron microscopy. The persistence length (L-p) of the fibrillar aggregates was found to be similar to 18 nm, as inferred from combined measurements of the radius of gyration and of the contour length. The values of both the weight-average molecular weight and the mass per unit length of the fibers suggest that the latter consist of few aggregated monomolecular wires. At T = 25 degrees C, the formation of branched aggregates occurs around the crossover concentration, C*, between the dilute and semidilute regimes, whereas the classical behavior of equilibrium polymers is observed at T = 65 degrees C. (c) 2006 Wiley Periodicals, Inc.
Référence
J Polym Sci Pt B-polym Phys. 2007 Jan 1;45(1):103-15