Measurement of thermophysical properties of polyvinyl alcohol complexed with some metal ions
| Autor: | S. M. Mokhtar, A. Z. Dakroury, Massarat B. S. Osman, B. M. Abo El-Khair |
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| Rok vydání: | 1994 |
| Předmět: |
Materials science
Aqueous solution Polymers and Plastics Metal ions in aqueous solution Inorganic chemistry General Chemistry Condensed Matter Physics Thermal diffusivity Polyvinyl alcohol Metal chemistry.chemical_compound Thermal conductivity Ultraviolet visible spectroscopy chemistry Volumetric heat capacity visual_art Materials Chemistry visual_art.visual_art_medium Nuclear chemistry |
| Zdroj: | Journal of Macromolecular Science, Part B. 33:387-395 |
| ISSN: | 1525-609X 0022-2348 |
| DOI: | 10.1080/00222349408248100 |
| Popis: | Polyvinyl alcohol (PVA)-Cu(II) and PVA-Cr(III) complexes were prepared with different concentrations of CuC12 and Cr(NO3)3 salts. The structures of the obtained complexes were investigated using UV spectroscopy and x-ray analysis. The thermal properties (volumetric heat capacity, thermal diffusivity, and thermal conductivity) of aqueous solutions of PVA-metal complexes have been measured using the hot-wire (and strip) technique as a function of temperature (20°-80°C). The results show that the values of the thermal properties depend on the type and the concentration of metal ions bound to the polymeric chains of PVA and the temperatures. However, a considerable increase in the values of the thermal properties was observed for PVA-Cu(II) complex. The type of metal salt under investigation affects the structure of PVA. The complex of PVA-Cr(III) is more thermally stable than the complex of PVA with Cum. However, both polymer-metal complexes showed good properties which may make them acceptable for ... |
| Databáze: | OpenAIRE |
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