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Morphogenic Effect of Added Ions on Crew-Cut Aggregates of Polystyrene-b-poly(acrylic acid) Block Copolymers in Solutions
Abstract
The morphology of crew-cut aggregates of amphiphilic block copolymers in dilute solutions can be controlled by the addition of ions in micromolar (HCl, NaOH, CaCl 2, Ca(Ac) 2 ) or millimolar (NaCl) concentrations. The copolymers are highly asymmetric polystyrene- b -poly(acrylic acid) diblocks, PS- b -PAA, in which the lengths of the insoluble PS blocks are much longer than those of the soluble PAA blocks. In addition to spherical, rodlike, and univesicular or lamellar aggregates, large compound vesicles (LCVs), a new morphology, can be obtained from a single block copolymer. The morphogenic effect of different added ions on the crew-cut aggregates can be ascribed to the changed repulsive interactions among the hydrophilic PAA segments, due to neutralization by NaOH, protonation by HCl, ion-binding or bridging by Ca 2+, and electrostatic screening by NaCl, respectively. The formation of the LCVs may involve a secondary aggregation of individual vesicles and a subsequent fusion process. Some features of the spontaneously formed LCVs may make them especially useful as drug delivering vehicles, and as models of biological cells.
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Cited by
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Allen, C., Maysinger, D., & Eisenberg, A. (1999) · Colloids and Surfaces B: Biointerfaces · doi:10.1016/s0927-7765(99)00058-2 · Cited by 1,358
Self-citationThermodynamics versus Kinetics in Nanosynthesis
Wang, Y., He, J., Liu, C., Chong, W. H., & Chen, H. (2015) · Angewandte Chemie International Edition · doi:10.1002/anie.201402986 · Cited by 497
Polymeric Surfactants: Synthesis, Properties, and Links to Applications
Raffa, P., Wever, D. A. Z., Picchioni, F., & Broekhuis, A. A. (2015) · Chemical Reviews · doi:10.1021/cr500129h · Cited by 389
Xie, X., Ma, Y., Huang, L., Cai, M., Chen, Y., & Luo, X. (2015) · Colloids and Surfaces A: Physicochemical and Engineering Aspects · doi:10.1016/j.colsurfa.2014.12.018 · Cited by 10
Metadata
- Authors
- Zhang, L., & Eisenberg, A.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 1996-01-01
- Volume
- 29
- Issue
- 27
- Pages
- 8805-8815
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2057011165
- Cited by
- 404
- References
- 0
- FWCI
- 6.28
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Morphogenic Effect of Added Ions on Crew-Cut Aggregates of Polystyrene-b-poly(acrylic acid) Block Copolymers in Solutions. https://app.cochat.ai/papers/10.1021/ma961376t
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- Zhang, L., & Eisenberg, A. (1996). Morphogenic Effect of Added Ions on Crew-Cut Aggregates of Polystyrene-b-poly(acrylic acid) Block Copolymers in Solutions. Macromolecules. https://doi.org/10.1021/ma961376t
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