Studies of polymer solvation by dielectric relaxation spectroscopy II: Polyethylene glycol in methyl pyrrolidone
| Autor: | M. Stockhausen, H. Utzel, E. Wessling, E. Dachwitz |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics technology industry and agriculture Solvation Concentration effect macromolecular substances Polymer Polyethylene glycol Dielectric spectroscopy Solvent chemistry.chemical_compound Colloid and Surface Chemistry chemistry PEG ratio Polymer chemistry Materials Chemistry Physical chemistry Physical and Theoretical Chemistry Benzene |
| Zdroj: | Colloid & Polymer Science. 268:330-336 |
| ISSN: | 1435-1536 0303-402X |
| Popis: | Frequency domain dielectric spectroscopy (30 MHz to 72 GHz) is utilized to study solvation in polyethylene glycol (PEG) — methyl pyrrolidone (MPy) mixtures over the whole mixture range at 20 °C, in particular with PEG 200. Further pure PEGs (200 to 400) and butyl glycol (in the pure state and in benzene and n-hexane solution) are considered for comparison to facilitate the assessment of PEG relaxational behavior. It turns out that the PEG-MPy mixtures can be described in terms of a simple solvation model which takes into account only the bulk and the solvating solvent state. The solvation number per repeat unit is about 0.85 in the dilute solution limit. It decreases gradually with increasing PEG concentration in accordance with a solvation equilibrium model. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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