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Self-assembly of crystalline-coil diblock copolymers in solution: experimental phase map

Title data

Mihut, Adriana M. ; Crassous, Jérôme J. ; Schmalz, Holger ; Drechsler, Markus ; Ballauff, Matthias:
Self-assembly of crystalline-coil diblock copolymers in solution: experimental phase map.
In: Soft Matter. Vol. 8 (2012) Issue 11 . - pp. 3163-3173.
ISSN 1744-6848
DOI: https://doi.org/10.1039/c2sm06359j

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft
European Community, MRTN-CT-2004-504052 [POLYFILM]
Adolphe Merkle Foundation

Abstract in another language

We present the morphological phase map of semicrystalline poly(butadiene)-b-poly(ethylene oxide) (PB-b-PEO) diblock copolymers (BCP) in dilute n-heptane solutions. The solutions of the diblock copolymer have been quenched from 70 degrees C, that is above the melting temperature T-m of the PEO block, following two thermal pathways: (A) by direct immersion into liquid nitrogen and (B) by quenching to the crystallization temperature T-c of the PEO block. Scanning force microscopy (SFM) and transmission electron microscopy (TEM) allowed imaging of the dried crystalline morphologies, whereas in solution the micelles have been visualized by cryogenic transmission electron microscopy (cryo-TEM). The apparent hydrodynamic radii of the micellar structures in solution were determined by dynamic light scattering (DLS). The effects of the block length and block ratio, and the influence of the thermal history on the morphology have been systematically investigated for the series of PB-b-PEO BCP. In pathway A, different morphologies such as spheres, rods, worms and entangled cylinders have been observed; whereas in pathway B, as the weight fraction and the length of the PEO block increased, the morphology changed from spherical to cylindrical or to lamellar, and finally to large dendritic micelles. This tailoring of morphologies is fully reversible with temperature and was found to correlate to the crystalline state of the PEO chains.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: ISI:000300571600017
Keywords: AMPHIPHILIC BLOCK-COPOLYMERS; DILUTE-SOLUTION; CYLINDRICAL MICELLES; TRIBLOCK COPOLYMERS; SINGLE-CRYSTALS; MULTICOMPARTMENT MICELLES; SELECTIVE SOLVENT; SHAPED MORPHOLOGY; DRIVEN; OXIDE
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 06:52
Last Modified: 11 Jun 2015 11:23
URI: https://eref.uni-bayreuth.de/id/eprint/10066