Evolution of structure in a comb copolymer-surfactant coacervate

0507871 - ÚMCH 2020 RIV US eng J - Journal Article
Fanova, A. - Janata, Miroslav - Filippov, Sergey K. - Šlouf, Miroslav - Netopilík, Miloš - Mariani, A. - Štěpánek, M.
Evolution of structure in a comb copolymer-surfactant coacervate.
Macromolecules. Roč. 52, č. 16 (2019), s. 6303-6310. ISSN 0024-9297. E-ISSN 1520-5835
R&D Projects: GA MŠMT(CZ) LO1507; GA ČR(CZ) GA19-10429S; GA TA ČR(CZ) TE01020118
Institutional support: RVO:61389013
Keywords : polyelectrolyte-surfactant complexes * light and X-ray scattering techniques * time-resolved SAXS
OECD category: Polymer science
Impact factor: 5.918, year: 2019
Method of publishing: Limited access
https://pubs.acs.org/doi/10.1021/acs.macromol.9b00332

The interaction between a double-hydrophilic comb copolymer with the polyanionic backbone poly[methacrylic acid-stat-poly(ethylene glycol) methyl ether methacrylate] (PMAA–PEGMA) and the cationic surfactant N-dodecylpyridinium chloride (DPCl) was studied in alkaline aqueous solutions by using a combination of light and X-ray scattering techniques, covering 5 orders of magnitude in space (the q vector range from 10–5 to 5 nm–1) and time (from milliseconds to several hours). The results showed that the polyelectrolyte–surfactant (PE–S) complex of PMAA–PEGMA and DPCl forms micrometer-sized coacervate particles containing collapsed PMAA–PEGMA chains with attached and densely packed DPCl micelles. Time-resolved SAXS measurements coupled with a stopped-flow apparatus revealed that the phase separation of the PE–S complex into a coacervate phase occurred in <25 ms after mixing the polyelectrolyte and the surfactant. Thus, microphase separation was faster than the self-assembly of DPCl into densely packed micelles. The terminal stages of polyelectrolyte–surfactant coacervation were dictated by the Ostwald ripening of the droplets in the time range of hours.
Permanent Link: http://hdl.handle.net/11104/0299461