Effect of poly(vinyl pyrrolidone) on the morphology and physical properties of poly(vinyl alcohol)/sodium montmorillonite nanocomposite films

By D. Mondal, M. R. Mollick, B. Bhowmick, Dipanwita Maity, Mrinal Kanti Bain, D. Rana, A. Mukhopadhyay, K. Dana, D. Chattopadhyay. 2013

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Abstract Nanocomposites of poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP) and sodium montmorillonite (Na + MMT) were prepared by solution mixing and then cast into films. X-ray diffraction analysis and images of transmission electron microscopy establish the formation of PVA/Na + MMT intercalated nanocomposite. Exfoliated and highly intercalated PVA/PVP/Na + MMT nanocomposite formed in the presence of PVP. Inclusion of PVP in PVA/Na + MMT matrix enhances the hydrogen bonding interactions between PVA and Na + MMT and thus increases the mechanical properties and thermal stability of PVA/PVP/Na + MMT nanocomposites compared to PVA/Na + MMT nanocomposite. The interactions between PVA, PVP and Na + MMT were established by the Fourier transform infrared spectroscopy. The moisture absorption tendency of both the PVA and PVA/PVP films reduced after the incorporation of Na + MMT at 75% constant relative humidity. Differential scanning calorimetry studies show that the presence of PVP and Na + MMT both are responsible for reducing the heat of fusion, and crystallinity of PVA. The flow behavior of the PVA, PVA/PVP and its nanocomposite solutions has been also studied. Water vapor permeability of PVA/PVP/Na + MMT composite films decreased in the presence of nanoclay due to increasing tortuous paths for diffusion.

Subfields: Biomaterials, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/c68a08fcef46f378544f70567477e0420fc1ff51