Structural characterization of nanoparticles formed by fluorinated poly(2-oxazoline)-based polyphiles

0485457 - ÚMCH 2019 RIV GB eng J - Journal Article
Riabtseva, Anna - Kaberov, Leonid I. - Noirez, L. - Ryukhtin, Vasil - Nardin, C. - Verbraeken, B. - Hoogenboom, R. - Štěpánek, Petr - Filippov, Sergey K.
Structural characterization of nanoparticles formed by fluorinated poly(2-oxazoline)-based polyphiles.
European Polymer Journal. Roč. 99, February (2018), s. 518-527. ISSN 0014-3057. E-ISSN 1873-1945
R&D Projects: GA MŠMT(CZ) LH15213; GA MŠMT(CZ) LO1507
Grant - others:AV ČR(CZ) FWO-17-05
Program: Bilaterální spolupráce
Institutional support: RVO:61389013 ; RVO:61389005
Keywords : poly(2-oxazolines) * fluorinated polymers * small-angle X-ray scattering
OECD category: Polymer science; Condensed matter physics (including formerly solid state physics, supercond.) (UJF-V)
Impact factor: 3.621, year: 2018

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.
Permanent Link: http://hdl.handle.net/11104/0281825