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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents



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ID: 28478.0, MPI für Polymerforschung / MPI Polymerforschung
Self-assembly of polyelectrolyte rods in polymer gel and in solution: Small-angle neutron scattering study
Authors:Zaroslov, Y. D.; Gordeliy, V. I.; Kuklin, A. I.; Islamov, A. H.; Philippova, O. E.; Khokhlov, A. R.; Wegner, Gerhard
Language:English
Date of Publication (YYYY-MM-DD):2002-05-21
Title of Journal:Macromolecules
Journal Abbrev.:Macromolecules
Volume:35
Issue / Number:11
Start Page:4466
End Page:4471
Review Status:No review
Audience:Not Specified
Abstract / Description:Self-aggregation of rigid-rod poly(sodium p-phenylenesulfonate) in aqueous solution and inside water-swollen polyacrylamide gel was studied by small-angle neutron scattering. It was shown that both inside the hydrogel and in solution polyelectrolyte rods self-assemble into cylindrical aggregates having eight to nine single polymer chains in the cross-section, the chains being aligned parallel to the axis of the aggregate. The length of these aggregates is much higher than the contour length of a single chain. Gels with embedded rods were studied by contrast variation method in order to examine separately the scattering by the gel and by the rods. Two important observations were made. First, it was shown that the ordering of the rods in the gel resembles that in solution. Second, it was shown that the gel itself is more homogeneous in the presence of rods. Most probably, this effect is due to mobile counterions of rods, which counteract the formation of spatial inhomogeneities in the network during synthesis, because in an inhomogeneous network mobile counterions should be also distributed nonuniformly that is associated with significant translational entropy losses.
Comment of the Author/Creator:Date: 2002, MAY 21
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Moscow MV Lomonosov State Univ, Dept Phys, Moscow 117234, Russia; Joint Inst Nucl Res, Neutron Phys Lab, Dubna 141980, Russia
Identifiers:ISI:000175728100035 [ID No:1]
ISSN:0024-9297 [ID No:2]
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