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

Titelangaben

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. Bd. 8 (2012) Heft 11 . - S. 3163-3173.
ISSN 1744-6848
DOI: https://doi.org/10.1039/C2SM06359J

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Angaben zu Projekten

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

Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: ISI:000300571600017
Keywords: AMPHIPHILIC BLOCK-COPOLYMERS; DILUTE-SOLUTION; CYLINDRICAL MICELLES; TRIBLOCK COPOLYMERS; SINGLE-CRYSTALS; MULTICOMPARTMENT MICELLES; SELECTIVE SOLVENT; SHAPED MORPHOLOGY; DRIVEN; OXIDE
Institutionen der Universität: Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie
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
Profilfelder > Advanced Fields
Profilfelder > Advanced Fields > Polymer- und Kolloidforschung
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Eingestellt am: 27 Okt 2020 10:32
Letzte Änderung: 18 Nov 2020 08:12
URI: https://eref.uni-bayreuth.de/id/eprint/58695