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.
Evolution of Structure in a Comb Copolymer-Surfactant Coacervate / Fanova, A.; Janata, M.; Filippov, S. K.; Slouf, M.; Netopilik, M.; Mariani, A.; Stepanek, M.. - In: MACROMOLECULES. - ISSN 0024-9297. - 52:16(2019), pp. 6303-6310. [10.1021/acs.macromol.9b00332]
Evolution of Structure in a Comb Copolymer-Surfactant Coacervate
Mariani A.Writing – Original Draft Preparation
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2019-01-01
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
