Influence of the shear rate, of the molecular architecture and of the molecular mass on the critical overlapping concentration c

The critical overlapping concentration c * has been studied in the dynamic state (by viscometry) and in the static state (by light scattering). An increase of the shear rate of the solution provokes an increase of c * in the case of linear polymers. In the case of a highly branched polymer the shear...

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Bibliographic Details
Published in:Polymer (Guilford) 1998, Vol.39 (11), p.2195-2199
Main Authors: Papanagopoulos, D., Pierri, E., Dondos, A.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
overlapping concentration
Physicochemistry of polymers
Properties and characterization
shear rate
Solution and gel properties
viscometry
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Summary:The critical overlapping concentration c * has been studied in the dynamic state (by viscometry) and in the static state (by light scattering). An increase of the shear rate of the solution provokes an increase of c * in the case of linear polymers. In the case of a highly branched polymer the shear rate has no influence on its critical concentration. The scaling law between c * and the molecular mass for a given polymer—solvent system presents two different exponents, depending on the molecular mass region of the polymer.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(97)00522-3