This title appears in the Scientific Report :
2003
Please use the identifier:
http://dx.doi.org/10.1107/S0021889803013761 in citations.
Please use the identifier: http://hdl.handle.net/2128/2855 in citations.
A small-angle neutron scattering investigation of rigid polyelectrolytes under shear
A small-angle neutron scattering investigation of rigid polyelectrolytes under shear
Solutions of a rigid polyelectrolyte molecule, sulfo-poly( phenyleneterephthalamide) (SPTTA), in deuterated water have been investigated using small-angle neutron scattering. At low concentrations ( 1 wt%) the scattering spectrum presents a soft maximum similar to that of the interaction of rod-like...
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Personal Name(s): | Mendes, E. |
---|---|
Viale, S. / Santin, O. / Heinrich, M. / Picken, S. J. | |
Contributing Institute: |
Neutronenstreuung; IFF-NST |
Published in: | Journal of applied crystallography, 36 (2003) S. 1000 - 1005 |
Imprint: |
Copenhagen
Munksgaard
2003
|
Physical Description: |
1000 - 1005 |
DOI: |
10.1107/S0021889803013761 |
Document Type: |
Journal Article |
Research Program: |
Kondensierte Materie |
Series Title: |
Journal of Applied Crystallography
36 |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/2855 in citations.
Solutions of a rigid polyelectrolyte molecule, sulfo-poly( phenyleneterephthalamide) (SPTTA), in deuterated water have been investigated using small-angle neutron scattering. At low concentrations ( 1 wt%) the scattering spectrum presents a soft maximum similar to that of the interaction of rod-like objects. Two counterions are used, H+ and Li+, and it is shown that aggregation is favoured as the proportion of Li+ counterions increases. When kept at rest at room temperature, the solutions exhibit spontaneous birefringence. A 1 wt% solution was investigated under shear and it is shown that a very small shear rate is needed to produce a very strong alignment of rod-like objects. Such alignment saturates at high shear rates. Upon cessation of shear, a very long relaxation time is observed. The set of results strongly suggest aggregation of rigid polyelectrolyte molecules into long needles exhibiting very small cross sections. |