| 초록 |
Polymer networks swollen in a aqueous liquid are called as hydrogels. Once cross-linked, either chemically or non-covalently, the polymer chains lose their individual identity and become part of a large three-dimensional interconnected network pervading through the entire solution volume. Hydrogels have promising potential as smart materials that show structural and physical changes by environment stimuli factors such as temperature, pH value, electric field and solvent composition. Poly(vinyl alcohol)(PVA) is a typical water soluble polymer. Poly(acrylic acid)(PAA) was selected as a cross-linking reagent because it has a functional carboxyl group in every monomer unit to react with PVA and the characteristics including high solubility in a water as a solvent for the casting solution and high miscibility with PVA. In this work, we prepared PVA/PAA hydrogel films with various crosslinking temperature and time and investigated pH-sensing behavior and the properties of the gel films. |
