Titlebar

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

 

Flow-Induced Ordering in Cubic Gels Formed by P2VP-b-PEO-b-P(GME-co-EGE) Triblock Terpolymer Micelles : A Rheo-SANS Study

Title data

Reinicke, Stefan ; Karg, Matthias ; Lapp, Alain ; Heymann, Lutz ; Hellweg, Thomas ; Schmalz, Holger:
Flow-Induced Ordering in Cubic Gels Formed by P2VP-b-PEO-b-P(GME-co-EGE) Triblock Terpolymer Micelles : A Rheo-SANS Study.
In: Macromolecules. Vol. 43 (14 December 2010) Issue 23 . - pp. 10045-10054.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma101768b

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Small-angle neutron scattering (SANS) measurements under steady shear were performed to determine the exact nature and degree of structural order within a hydrogel based on poly(2-vinylpyridine)-block-poly(ethylene oxide)-block-poly(glycidyl methyl ether-co-ethyl glycidyl ether) (P2VP(56)-b-PEO410-b-P(GME(48)-co-EGE(48))) triblock terpolymer micelles. Previous static SANS measurements indicated the presence of a simple cubic (sc) or body centered cubic (bcc) packing. By exposing the sample to steady shear, different macroscopic structural transitions were induced, indicated by a stress plateau and a significant change of the 2D SANS patterns. A comparison of these 2D patterns with patterns from analogous systems reported in literature and theoretical predictions revealed the presence of a bcc structure. Furthermore, with increasing shear rate the structural alignment changes from a nonoriented state to an intermediate state consisting of polycrystalline bcc domains with weak preferential orientation, and finally to a highly aligned state in which twinned bcc domains exist. The 111] axis of the twinned bcc crystals is aligned in the direction of the shear flow, and the {110} slipping planes are preferentially aligned parallel to the shear plane (walls of the Couette cell). A minor fraction of twinned bcc domains, probably located in regions of lower shear velocity, i.e., close to the inner wall of the Couette cell (stator), is tilted by an angle of 90 degrees with respect to the shear plane.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: ISI:000284967000057
Keywords: ANGLE NEUTRON-SCATTERING; TRANSFER RADICAL POLYMERIZATION; BLOCK-COPOLYMER HYDROGELS; SHEAR-INDUCED ORIENTATION; DIBLOCK COPOLYMER; STEADY-SHEAR; THERMORESPONSIVE HYDROGELS; POLY(ETHYLENE GLYCOL); DISORDER TRANSITION; AQUEOUS-SOLUTION
Institutions of the University: Faculties
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 Physical Chemistry I
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
Faculties > Faculty of Engineering Science > Chair Applied Mechanis and Fluid Dynamics
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Polymer and Colloid Science
Faculties > Faculty of Engineering Science
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 14 Apr 2015 07:13
Last Modified: 27 Nov 2015 07:37
URI: https://eref.uni-bayreuth.de/id/eprint/10073