Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Gel formation in a mixture of a block copolymer and a nematic liquid crystal

DOI zum Zitieren dieses Dokuments: https://doi.org/10.1103/PhysRevE.84.021710
URN to cite this document: urn:nbn:de:bvb:703-epub-3951-4

Title data

Khazimullin, Maxim ; Müller, Thomas ; Messlinger, Stephan ; Rehberg, Ingo ; Schöpf, Wolfgang ; Krekhov, Alexei ; Pettau, Robin ; Kreger, Klaus ; Schmidt, Hans-Werner:
Gel formation in a mixture of a block copolymer and a nematic liquid crystal.
In: Physical Review E. Vol. 84 (2011) Issue 2 . - 021710.
ISSN 1550-2376
DOI: https://doi.org/10.1103/PhysRevE.84.021710

[img] PDF
PhysRevE.84.021710.pdf - Published Version
Available under License Deutsches Urheberrechtsgesetz .

Download (636kB)

Abstract

The viscoelastic properties of a binary mixture of a mesogenic side-chain block copolymer in a low molecular weight nematic liquid crystal are studied for mass concentrations ranging from the diluted regime up to a liquid crystalline gel state at about 3%. In the gel state, the system does not flow, exhibits a polydomain structure on a microscopic level, and strongly scatters light. Below the gelation point, the system is homogeneous and behaves like a usual nematic, so the continuum theory of liquid crystals can be applied for interpreting the experimental data. Using the dynamic Fréedericksz transition technique, the dependence of the splay elastic constant and the rotational viscosity on the polymer concentration have been obtained. Comparing the dynamic behavior of block copolymer solutions with the respective homopolymer solutions reveals that, above a mass concentration of 1%, self-assembling of the block copolymer chain segments in clusters occurred, resulting in a gel state at higher concentrations. The effective cluster size is estimated as a function of the concentration, and a scaling-law behavior near the sol-gel transition is confirmed. This technique may serve as an alternative method for determining the gelation point.

Further data

Item Type: Article in a journal
Keywords: Liquid crystals; Physical gels and microgels; Experimental studies of liquid crystal transitions; Gels and sols.
DDC Subjects: 500 Science
500 Science > 530 Physics
500 Science > 540 Chemistry
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V > Chair Experimental Physics V - Univ.-Prof. Dr. Ingo Rehberg
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics I
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I > Chair Macromolecular Chemistry I - Univ.-Prof. Dr. Hans-Werner Schmidt
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Advanced Fields > Advanced Materials
Profile Fields > Advanced Fields > Nonlinear Dynamics
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions > Collaborative Research Centers, Research Unit
Research Institutions > Collaborative Research Centers, Research Unit > FOR 608 Nichtlineare Dynamik komplexer Kontinua
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-3951-4
Date Deposited: 24 Jan 2019 11:51
Last Modified: 24 Jan 2019 11:51
URI: https://epub.uni-bayreuth.de/id/eprint/3951

Downloads

Downloads per month over past year