Tracer microrheology study of a hydrophobically modified comblike associative polymer
| Autor: | Saad A. Khan, Ahmed Abdala, Samiul Amin, John H. van Zanten |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Microrheology
chemistry.chemical_classification Quantitative Biology::Biomolecules Diffusing-wave spectroscopy Materials science Rheometry Polymers Thermodynamics Concentration effect Surfaces and Interfaces Polymer Condensed Matter Physics Viscoelasticity Condensed Matter::Soft Condensed Matter Rheology chemistry Polymer chemistry Electrochemistry General Materials Science Elastic modulus Hydrophobic and Hydrophilic Interactions Spectroscopy |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids. 31(13) |
| ISSN: | 1520-5827 |
| Popis: | The viscoelastic properties of associative polymers are important not only for their use as rheology modifiers but also to understand their complex structure in aqueous media. In this study, the dynamics of comblike hydrophobically modified alkali swellable associative (HASE) polymers are probed using diffusing wave spectroscopy (DWS) based tracer microrheology. DWS-based tracer microrheology accurately probes the dynamics of HASE polymers, and the extracted microrheological moduli versus frequency profile obtained from this technique closely matches that obtained from rotational rheometry measurements. Quantitatively, however, the moduli extracted from DWS-based tracer microrheology measurements are slightly higher than those obtained using rotational rheometry. The creep compliance, elastic modulus, and relaxation time concentration scaling behavior exhibits a power-law dependence. The length scale associated with the elastic to glassy behavior change is obtained from the time-dependent diffusion coefficient. The Zimm-Rouse type scaling is recovered at high frequencies but shows a concentration effect switching from Zimm to more Rouse-like behavior at higher concentrations. |
| Databáze: | OpenAIRE |
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