Preparation and Determination of the Characteristics of Hydrogel Membrane of Poly-Vinyl Alchol, Starch and Chitosan

Document Type : Research Paper


1 Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Biomaterial Department of Iran Polymer and Petrochemical Institute, Tehran, Iran

3 Faculty of Advanced Sciences and Technologies, Department of Biotechnology, University of Isfahan, Iran

4 Department of Biology, University of Isfahan, Isfahan, Iran


In this study, a new kind of crosslinking film of polyvinyl alcohol, starch, and chitosan was obtained by alternating freeze-thaw cycles, and its various properties such as swelling rate, water vapor transmission rate, mechanical properties, and morphology were checked using electron microscopy. The results of this study showed that the hydrogel, made by providing a damp environment and the ability to pass water vapor in the range 720-1680 g/m2, has acceptable mechanical properties so that the fracture stress in polyvinyl alcohol was equal to 0.642 kgf/ mm2, which reached 0.372 kgf/ mm2 with the introduction of starch and 0.2475 kgf/ mm2 with the addition of chitosan. When we add starch and chitosan to polyvinyl alcohol at the same time, the fracture stress reaches 0.261 kgf/ mm2. In the sample containing pure polyvinyl alcohol, the elastic strain is equal to 6.157 and with the addition of starch, this value reaches 4.625 and with the addition of chitosan, this value reaches 5.70. Adding starch and chitosan to polyvinyl alcohol increases the modulus and toughness and decreases the flexibility of the polyvinyl alcohol hydrogel membrane. Images of SEM from a cross-section of hydrogel membrane fracture show that hydrogel membranes containing polyvinyl alcohol are very smooth and monotonous; however, when starch and chitosan are added to polyvinyl alcohol, the porosity will increase.


Main Subjects

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