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Acta Chemica Iasi

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Polyvinyl alcohol/chitosan/montmorillonite nanocomposites preparation by freeze/thaw cycles and characterization

Elena Părpăriţă
  • Petru Poni” Institute of Macromolecular Chemistry, Physical Chemistry of Polymers Department, 41A Gr. Ghica Voda Alley, 700487, Iasi, Romania
  • Other articles by this author:
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/ Cătălina N. Cheaburu
  • Petru Poni” Institute of Macromolecular Chemistry, Physical Chemistry of Polymers Department, 41A Gr. Ghica Voda Alley, 700487, Iasi, Romania
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Silvia Florica Pațachia
  • “Transilvania” University of Brasov, Department of Chemistry, 29 Eroilor Str. Brașov, Romania
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/ Cornelia Vasile
  • Petru Poni” Institute of Macromolecular Chemistry, Physical Chemistry of Polymers Department, 41A Gr. Ghica Voda Alley, 700487, Iasi, Romania
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Published Online: 2014-12-30 | DOI: https://doi.org/10.2478/achi-2014-0008


Polyvinyl alcohol (PVA) and chitosan (CS) based hydrogels are often chosen to obtain hydrogels as being considered non-toxic for human body. The present study aims the preparation and physical chemical characterisation of hydrogels based PVA and CS by using an environmental friendly method i.e. freeze/thaw. In this method the only parameters affecting the hydrogels’ properties is the PVA concentration in solution, time and number of cycles of freezing / thawing. Repeated freezing and thawing cycles resulted in production of a highly elastic polyvinyl alcohol hydrogel with higher degree of crystallization. Adding chitosan in polyvinyl alcohol hydrogel is giving to the newly formed material, biocompatibility and antibacterial properties due to the free amino groups of chitosan. Higher mechanical and thermal characteristics of PVA/CS based hydrogels were obtained by addition of a small amount of inorganic nanoparticles (montmorillonite clay, C30B) into the matrix (i.e. 1%). Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), near-infrared chemical imaging spectroscopy (NI-CI), X-ray diffraction (XRD), thermogravimetric analysis (TG), swelling and rheological measurements were used to characterize the polyvinyl alcohol/chitosan/montmorillonite properties. The swelling degree increased with decreasing chitosan content in hydrogels and the variation is opposite in nanocomposites, decreasing after introducing the nanoclay. The swelling behaviour was influenced by the presence of the nanoparticles. The plasticizer effect of the nanoparticles was reflected by obtaining a more compact hydrogel network with higher mechanical and thermal properties. The proposed materials can be a promising alternative in biomedical applications

Keywords: Polyvinyl alcohol; Chitosan; Montmorillonite; Hydrogels; Freezing/thawing


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About the article

Published Online: 2014-12-30

Published in Print: 2014-12-01

Citation Information: Acta Chemica Iasi, Volume 22, Issue 2, Pages 75–96, ISSN (Online) 2067-2446, DOI: https://doi.org/10.2478/achi-2014-0008.

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© Alexandru Ioan Cuza University in Iaşi . This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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