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Crystallization-induced aggregation of block copolymer micelles : influence of crystallization kinetics on morphology

Title data

Mihut, Adriana M. ; Crassous, Jérôme J. ; Schmalz, Holger ; Ballauff, Matthias:
Crystallization-induced aggregation of block copolymer micelles : influence of crystallization kinetics on morphology.
In: Colloid and Polymer Science. Vol. 288 (March 2010) Issue 5 . - pp. 573-578.
ISSN 1435-1536
DOI: https://doi.org/10.1007/s00396-010-2185-y

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft
European Community, Grant Number MRTN-CT2004-504052

Abstract in another language

We present a systematic investigation of the crystallization and aggregation behavior of a poly(1,2-butadiene)-block-poly(ethylene oxide) diblock copolymer (PB-b-PEO) in n-heptane. n-Heptane is a poor solvent for PEO and at 70A degrees C the block copolymer self-assembles into spherical micelles composed of a liquid PEO core and a soluble PB corona. Time- and temperature-dependent light scattering experiments revealed that when crystallization of the PEO cores is induced by cooling, the crystal morphology depends on the crystallization temperature (T (c) ): Below 30A degrees C, the high nucleation rate of the PEO core dictates the growth of the crystals by a fast aggregation of the micelles into meander-like (branched) structures due to a depletion of the micelles at the growth front. Above 30A degrees C the nucleation rate is diminished and a relatively small crystal growth rate leads to the formation of twisted lamellae as imaged by scanning force microscopy. All data demonstrate that the formation mechanism of the crystals through micellar aggregation is dictated by two competitive effects, namely, by the nucleation and growth of the PEO core.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Block copolymer; Crystalline micelles; Self-assembly; Selective solvent
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: 14 Apr 2015 07:18
Last Modified: 11 Jun 2015 11:24
URI: https://eref.uni-bayreuth.de/id/eprint/10076