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

Titelangaben

Schmelz, Joachim ; Schedl, Andreas ; 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. Bd. 134 (2012) Heft 34 . - S. 14217-14225.
ISSN 1520-5126
DOI: https://doi.org/10.1021/ja306264d

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Projektfinanzierung: Deutsche Forschungsgemeinschaft
Elitenetzwerk Bayern

Abstract

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.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: ISI:000308043400046
Keywords: RADICAL POLYMERIZATION; CYLINDRICAL MICELLES; DIBLOCK COPOLYMERS; CORONA; MICELLIZATION; TERPOLYMER; MORPHOLOGY; COMPLEX; SCOPE
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Makromolekulare Chemie II
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Makromolekulare Chemie II > Lehrstuhl Makromolekulare Chemie II - Univ.-Prof. Dr. Andreas Greiner
Profilfelder > Advanced Fields > Polymer- und Kolloidforschung
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie
Profilfelder
Profilfelder > Advanced Fields
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Eingestellt am: 09 Apr 2015 13:11
Letzte Änderung: 12 Mai 2022 13:19
URI: https://eref.uni-bayreuth.de/id/eprint/10057