Analysis of Water Sorption Isotherms of Superabsorbent Polymers by Solution Thermodynamics
| Autor: | Toshimasa Yano, Hitoshi Kumagai, Hitomi Kumagai, Akinori Mizuno |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
chemistry.chemical_classification
Water activity Chemistry Organic Chemistry technology industry and agriculture Food preservation Thermodynamics General Medicine Polymer Water sorption complex mixtures Applied Microbiology and Biotechnology Biochemistry Analytical Chemistry Gibbs free energy symbols.namesake Superabsorbent polymer symbols Sorption isotherm Molecular Biology Water content Biotechnology |
| Zdroj: | Bioscience, Biotechnology, and Biochemistry. 61:936-941 |
| ISSN: | 1347-6947 0916-8451 |
| Popis: | Water sorption isotherms of superabsorbent polymers were measured, and their affinity for water was evaluated by solution thermodynamics. The results provide basic data for the functional packaging of food to control the water content of food during its transportation or storage. Water activity above 0.9 was measured by adding a specific amount of water to the samples, while that below 0.9 was measured with apparatus for evaluating water sorption isotherms. Thus, water sorption isotherms for superabsorbent polymers were obtained up to a water activity of approximately 0.98. The amount of water sorbed by the superabsorbent polymers was influenced by the type of functional groups in the polymers, and not by the degree of cross-linking in the polymers. The integral Gibbs free energy, which is the most suitable parameter for evaluating the affinity of a material for water, was evaluated from the water sorption isotherms by using solution thermodynamics. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|