Kinetics of Morphological Transition between Cylindrical and Spherical Micelles in a Mixture of Anionic–Neutral and Cationic–Neutral Block Copolymers Studied by Time-Resolved SAXS and USAXS
Abstract
This study is concerned with the morphological transition kinetics of polyelectrolyte complex micelles formed from an anionic–neutral block copolymer and a cationic–neutral block copolymer in aqueous NaCl solution. The transformation was induced by changing the mixing ratio of the anionic and cationic monomer units in the copolymers. The kinetics of the morphological transition was directly tracked by time-resolved (ultra) small-angle X-ray scattering coupled with rapid mixing of the block copolymer components by a stopped flow apparatus. The transformation from cylindrical to spherical micelles upon changing the mixing ratio of the copolymers was reversible, and the process occurred via the random scission of the cylindrical micelles along their contours. The reverse transition from spherical to cylindrical micelles was found to be a slow process with high activation energy.
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Using Tr-SAXS integrated with a microfluidic device, micellization kinetics of PEG-b-PCL was measured in situ with temporal resolution of millisecond and spatial resolution of micrometer.
“Using synchrotron small-angle X-ray scattering (Tr-SAXS) integrated with a microfluidic device, micellization kinetics of a diblock co-polymer, poly (ethylene glycol)-b-poly(caprolactone) (PEG-b-PCL) was measured in situ with temporal resolution of millisecond and spatial resolution of micrometer [215].”
From Polymeric micelles in drug delivery: An insight of the techniques for their characterization and assessment in biorelevant conditions (2021) · cites this paper as [215]
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Ghezzi, M., Pescina, S., Padula, C., Santi, P., Del Favero, E., Cantù, L., & Nicoli, S. (2021) · Journal of Controlled Release · doi:10.1016/j.jconrel.2021.02.031 · Cited by 1,135 · see citing works
Synchrotron scattering methods for nanomaterials and soft matter research
Narayanan, T., & Konovalov, O. (2020) · Materials · doi:10.3390/ma13030752 · Cited by 60 · see citing works
Self-citation
- Authors
- Takahashi, R., Narayanan, T., Yusa, S.-I., & Sato, T.
- Affiliations
- The University of Kitakyushu (JP)
- European Synchrotron Radiation Facility (FR)
- University of Hyogo (JP)
- The University of Osaka (JP)
- Corresponding author
- Sato, Takahiro
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-05-03
- Volume
- 51
- Issue
- 10
- Pages
- 3654-3662
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2801402094
- Cited by
- 36
- References
- 0
- Citations by year
- 2026: 2 · 2025: 6 · 2024: 3 · 2022: 4 · 2021: 7 · 2020: 8 · 2019: 5 · 2018: 1
- FWCI
- 2.15
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Macromolecules (publishedVersion)
- Funders
- Japan Society for the Promotion of Science (16J00359)
- Topics
- Physical Sciences › Chemistry › Organic Chemistry › Advanced Polymer Synthesis and Characterization
- Physical Sciences › Chemistry › Organic Chemistry › Surfactants and Colloidal Systems
- Physical Sciences › Materials Science › Materials Chemistry › Block Copolymer Self-Assembly
- Keywords
- polyelectrolyte complex micelles, mixing ratio, activation energy, time-resolved small-angle X-ray scattering, stopped-flow mixing
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