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Multiple morphologies, phase transitions, and cross-linking of crew-cut aggregates of polybutadiene-block-poly(2-vinylpyridine) diblock copolymers

Title data

Walther, Andreas ; Goldmann, Anja S. ; Yelamanchili, Ram Sai ; Drechsler, Markus ; Schmalz, Holger ; Eisenberg, Adi ; Müller, Axel H. E.:
Multiple morphologies, phase transitions, and cross-linking of crew-cut aggregates of polybutadiene-block-poly(2-vinylpyridine) diblock copolymers.
In: Macromolecules. Vol. 41 (13 May 2008) Issue 9 . - pp. 3254-3260.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma7026148

Official URL: Volltext

Abstract in another language

We describe detailed investigations on the self-assembly of polybutadiene-block-poly(2-vinylpyridine) diblock copolymers into so-called crew-cut micellar aggregates in aqueous media. Three analogous diblock copolymers with different short segments of poly (2-vinylpyridine) were synthesized via anionic polymerization. The self-assembled aggregates are studied in dioxane/water mixtures by means of dynamic light scattering! and transmission electron microscopy. Depending on the added volume fraction of water, spherical micelles. branched cylindrical micelles, and vesicles can be found. These aggregates can be cross-linked in a facile fashion using a UV photoinitiator. The structures of the crew-cut aggregates remain intact during cross-linking, yielding stabilized polymeric nanoparticles. A transfer of these nanoparticles into common, only slightly selective solvents, in which no aggregates or different type of aggregates would exist without cross-linking, is possible. The cross-linked nanoparticle structures remain unchanged during this process. Moreover, a new pathway for the phase transition of cylindrical micelles to vesicles was found and is elucidated.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: BLOCK-COPOLYMERS; MICELLE-VESICLE TRANSITIONS; AQUEOUS-SOLUTION; DILUTE-SOLUTION; TERNARY-SYSTEM; LENGTH DISTRIBUTION; TRIBLOCK COPOLYMER; KINETICS; SOLVENT; MICELLIZATION
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner
Profile Fields > Advanced Fields > Polymer and Colloid Science
Research Institutions > Research Centres > Bayreuth Center for Colloids and Interfaces - BZKG
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 15 Apr 2015 07:09
Last Modified: 15 Apr 2015 07:09
URI: https://eref.uni-bayreuth.de/id/eprint/10091