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Length Control and Block-Type Architectures in Worm-like Micelles with Polyethylene Cores

Title data

Schmelz, Joachim ; Schedl, Andreas Erich ; Steinlein, Christoph ; Manners, Ian ; Schmalz, Holger:
Length Control and Block-Type Architectures in Worm-like Micelles with Polyethylene Cores.
In: Journal of the American Chemical Society. Vol. 134 (August 2012) Issue 34 . - pp. 14217-14225.
ISSN 1520-5126
DOI: https://doi.org/10.1021/ja306264d

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft
Elitenetzwerk Bayern

Abstract in another language

We present evidence for "living"-like behavior in the crystallization-driven self-assembly of triblock copolymers with crystallizable polyethylene middle blocks into worm-like crystalline-core micelles (CCMs). A new method of seed production is introduced utilizing the selective self-assembly of the triblock copolymers into spherical CCMs in appropriate solvents. Seeded growth of triblock copolymer unimers from these spherical CCMs results in worm-like CCMs with narrow length distributions and mean lengths that depend linearly on the applied unimer-to-seed ratio. Depending on the applied triblock copolymer, polystyrene-block-polyethylene-block-polystyrene (SES) or polystyrene-block-polyethylene-block-poly(methyl methacrylate) (SEM), well-defined worm-like CCMs with a homogeneous or patch-like corona, respectively, can be produced. In a subsequent step, these worm-like CCMs can be used as seeds for the epitaxial growth of a different polyethylene containing triblock copolymer. In this manner, ABA-type triblock co-micelles containing blocks with a homogeneous polystyrene corona and those with a patch-like polystyrene/poly(methyl methacrylate) corona were prepared. While the epitaxial growth of SEM unimers from worm-like SES CCMs with a homogeneous corona yields triblock co-micelles almost quantitatively, the addition of SES unimers to patchy SEM wCCMs results in a mixture of ABA- and AB-type block co-micelles together with residual patchy wCCMs. Following reports on self-assembled block-type architectures from polymers containing core-forming polyferrocenylsilane blocks, these structures represent the first extension of the concept to block co-micelles from purely organic block copolymers.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: ISI:000308043400046
Keywords: RADICAL POLYMERIZATION; CYLINDRICAL MICELLES; DIBLOCK COPOLYMERS; CORONA; MICELLIZATION; TERPOLYMER; MORPHOLOGY; COMPLEX; SCOPE
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
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
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 09 Apr 2015 13:11
Last Modified: 09 Jun 2015 14:59
URI: https://eref.uni-bayreuth.de/id/eprint/10057