Laboratoire Léon Brillouin
UMR12 CEA-CNRS, Bât. 563 CEA Saclay
91191 Gif sur Yvette Cedex, France
We report on the self-assembly behavior of poly(2-methyl-2-oxazoline)–block–poly(2-octyl-2-oxazoline) comprising different terminal perfluoroalkyl fragments in aqueous solutions. As reported previously [Kaberov et al. (2017)] such polyphiles can form a plethora of nanostructures depending of the composition and on the way of preparation. Here we report, for the first time, detailed information on the internal structure of the nanoparticles resulting from the self-assembly of these copolymers. Small-angle neutron and X-ray scattering (SANS/SAXS) experiments unambiguously prove the existence of polymersomes, wormlike micelles and their aggregates in aqueous solution. It is shown that increasing content of fluorine in the poly(2-oxazoline) copolymers results in a morphological transition from bilayered or multi-layered vesicles to wormlike micelles for solutions prepared by direct dissolution.
In contrast, nanoparticles prepared by dialysis of a polymer solution in a non-selective organic solvent against water are characterized by SAXS method. The internal structure of the nanoparticles could be assessed by fitting of the scattering data, revealing complex core-double shell architecture of spherical symmetry. Additionally, long range ordering is identified for all studied nanoparticles due to the crystallization of the poly(2-octyl-2-oxazoline) segments inside the nanoparticles.
• Physics, chemistry, nanoscience and materials around large instruments › Physique de la matière condensée, étude par l’interaction rayonnement matière Systèmes complexes et transition énergétique › Physique statistique et systèmes complexes Physics and chemistry for life sciences and the environment Physique, chimie, nanosciences et matériaux autour des grands instruments Statistical physics and complex systems
• Laboratoire Léon Brillouin (LLB) • Leon Brillouin Laboratory (LLB)
• Biologie et Systèmes Désordonnés - GBSD (appareils 7C2, Paxe, Mibemol et Muse) • Soft Complex Matter • Small angle scattering
• Neutrons • Diffractomètres de "diffusion de neutrons aux petits angles" : PACE, PA20, PAxy, TPA • Small Angle Neutron Scattering (PA) • Neutrons