Unusual complexation behavior of poly(acrylic acid) induced by shear
| Autor: | T. Long, O.-K. Kim, K. Mcgrath, L. S. Choi, J. P. Armistead, T. H. Yoon |
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| Rok vydání: | 1993 |
| Předmět: |
Shearing (physics)
Aqueous solution Polymers and Plastics Stereochemistry Hydrogen bond Organic Chemistry Concentration effect biochemical phenomena metabolism and nutrition Polyelectrolyte Inorganic Chemistry chemistry.chemical_compound chemistry Ionic strength Polymer chemistry Materials Chemistry Shear flow Acrylic acid |
| Zdroj: | Macromolecules. 26:379-384 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma00054a018 |
| Popis: | Poly(acrylic acid) (PAA) in dilute solution undergoes a stable interchain association under high shear flow. This reflected in a sharp decreased in drag reduction (DR). For this flow-indued deformation to occur the PAA must be of the ultrahigh molecular weight (≥ 5×10 -4 M), and in a pH range of 6-8. Addition of a minute amount of salt to the shearing PAA solution induced a full recovery of the DR, suggesting a disruption of interchain association. Fluorescence results suggest that shearing has developed a rigidity along the PAA chain. This is probably the direct resul of supermolecular chain complexation by intercahain H-bonding |
| Databáze: | OpenAIRE |
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