This title appears in the Scientific Report :
2005
Please use the identifier:
http://dx.doi.org/10.1016/j.polymer.2005.05.096 in citations.
Phase separation in randomly charged polystyrene sulphonate ionomer solutions
Phase separation in randomly charged polystyrene sulphonate ionomer solutions
The dynamics of randomly charged polystyrene caesium-sulfonate ionomers in semi-dilute solutions were studied using a combination of dynamic light scattering (DLS), small angle neutron scattering (SANS), and bulk rheology. The samples were studied in toluene solutions where the aggregation of the di...
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Personal Name(s): | de Luca, E. |
---|---|
Waigh, T. A. / Kim, J. S. / Jeon, H. S. / Pyckhout-Hintzen, W. | |
Contributing Institute: |
Neutronenstreuung; IFF-INS |
Published in: | Polymer, 46 (2005) S. 7109 - 7117 |
Imprint: |
Oxford
Elsevier Science
2005
|
Physical Description: |
7109 - 7117 |
DOI: |
10.1016/j.polymer.2005.05.096 |
Document Type: |
Journal Article |
Research Program: |
Kondensierte Materie |
Series Title: |
Polymer
46 |
Subject (ZB): | |
Publikationsportal JuSER |
The dynamics of randomly charged polystyrene caesium-sulfonate ionomers in semi-dilute solutions were studied using a combination of dynamic light scattering (DLS), small angle neutron scattering (SANS), and bulk rheology. The samples were studied in toluene solutions where the aggregation of the dipolar groups is favoured. Evidence of aggregation in dilute solution is found using DLS and SANS with both the hydrodynamic and static radius of gyration indicating that there is a contraction of the chains due to intra-chain attractive forces. SANS experiments demonstrate the evolution of the aggregates into a network structure as a function of polymer concentration. The association process is caused by the dipolar attraction between the charged groups and introduces two static correlation lengths in the mesh structure of the network; the standard semi-dilute mesh size (xi = 1.12c(-0.72 +/- 0.03)) and an inhomogeneity length (Xi = 24c(0.58 +/- 0.05)) due to micro-phase separation. The scaling of the amplitudes of the correlation lengths I-1(0)similar to c(-0.33 +/- 0.07) and I-2(0)similar to c(2.0 +/- 0.4) are consistent with good solvent conditions and micro-phase separation, respectively. An imposed shear causes the break up of the micro-phase separated micellar system with a characteristic yield stress for the Bingham step-like shear thinning. (c) 2005 Elsevier Ltd. All rights reserved. |