DOI: 10.1063/1.471723. Micellization of strongly segregated block copolymers

Micellization of strongly segregated block copolymers

10.1063/1.471723

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Series of diblock copolymers of the type poly(styrene-b-4-vinylpyridine) (PS-P4VP) are synthesized via anionic polymerization. In toluene, a selective solvent for the PS block, well-defined micelles with narrow molecular weight distribution are formed. Size and shape of the micelles are characterized by static (SLS) and dynamic light scattering (DLS), and electron microscopy (EM). The aggregation number Z exhibits a scaling relation Z∝N1.93P4VPN−0.79PS, where N is the degree of polymerization of each block. We find this behavior close to a Z∼N2AN−0.8B limiting scaling law which appears to be a characteristic of strongly segregated diblock and triblock copolymer systems as well as low molecular weight cationic, anionic, and nonionic surfactants. A simple micellization model is developed that predicts aggregation numbers of surfactants, diblock, triblock, and graft copolymers. The corona dimension Dh as measured by DLS scales as Dh∝Z0.21N0.63PS in agreement with the theoretical prediction D∼Z1/5N3/5B for starlike molecules in good solvents. Neither unimers nor a critical micelle concentration are observed. Instead at very low concentrations the excess scattering intensity increases due to the formation of large particles.

Bibliography

FÃ¶rster, S., Zisenis, M., Wenz, E., & Antonietti, M. (1996). Micellization of strongly segregated block copolymers. The Journal of Chemical Physics, 104(24), 9956â9970.

Authors 4

Stephan Förster (first)
Mathias Zisenis (additional)
Eckhard Wenz (additional)
Markus Antonietti (additional)

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Dates

Type	When
Created	23 years ago (July 26, 2002, 8:15 a.m.)
Deposited	2 years, 1 month ago (July 9, 2023, 11:53 a.m.)
Indexed	1 month, 2 weeks ago (July 9, 2025, 7:02 p.m.)
Issued	29 years, 2 months ago (June 22, 1996)
Published	29 years, 2 months ago (June 22, 1996)
Published Print	29 years, 2 months ago (June 22, 1996)

Funders 0

None

BibTeX

@article{F_rster_1996, title={Micellization of strongly segregated block copolymers}, volume={104}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.471723}, DOI={10.1063/1.471723}, number={24}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Förster, Stephan and Zisenis, Mathias and Wenz, Eckhard and Antonietti, Markus}, year={1996}, month=jun, pages={9956–9970} }

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