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Liquid crystalline phase behavior of well-defined cylindrical block copolymer micelles using synchrotron small-angle X-ray scattering
Authors:
Dominic
Hayward
(University of Bristol)
,
Joe
Gilroy
(University of Bristol)
,
Paul A.
Rupar
(University of Bristol)
,
Laurent
Chabanne
(University of Bristol)
,
Claire
Pizzey
(Diamond Light Source)
,
Mitchell A.
Winnik
(University of Toronto)
,
George
Whittell
(University of Bristol)
,
Ian
Manners
(University of Bristol)
,
R M
Richardson
(University of Bristol)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Macromolecules
, VOL 48 (5)
State:
Published (Approved)
Published:
February 2015
Diamond Proposal Number(s):
6035
Abstract: The structure and phase behaviour of colloidal solutions of monodisperse rod-shaped micelles, of different lengths (ca. 300 nm - 2100 nm) and formed from poly(ferrocenylsilane)-block-polyisoprene (PFS-b-PI) diblock copolymers, have been investigated using synchrotron small angle X-ray scattering. The dimensions of the crystalline PFS core, solvated PI corona and the overall radial polydispersity were measured and relationships between the characteristics of the constituent copolymers and the internal structure of the self-assembled micelles have been established. In addition, the effects of micelle length, length distribution, concentration, composition and block length on the liquid crystalline phase behaviour of the micelles have been determined. It was found that micelle dispersions exist in three distinct phases: isotropic, nematic and hexagonally-packed crystalline, depending predominantly on their concentration and aspect ratio. The results have also highlighted the importance of the coronal composition and structure in determining the high-concentration behaviour of micelle dispersions.
Journal Keywords: Chemical structure; Colloids; Micelles; Order; Scattering
Subject Areas:
Physics,
Materials,
Chemistry
Instruments:
I22-Small angle scattering & Diffraction
Added On:
17/02/2015 17:47
Discipline Tags:
Physics
Soft condensed matter physics
Chemistry
Materials Science
Polymer Science
Technical Tags:
Scattering
Small Angle X-ray Scattering (SAXS)