Effect of Fe3+–MMT on thermal degradation and mechanical behavior of PVP/Amylose nanocomposite films
Subject Areas : Journal of Physical & Theoretical Chemistry
naser sadeghpour orang
1
(Faculty of Technical Engineering, Department of Chemical Engineering, IAU, Ahar, Iran)
Reza Abdollahi
2
(Chemistry Department, South Tehran Branch, Islamic Azad University, Tehran, Iran)
Keywords: Amylose, Fe3+–MMT Nanocomposite, PVP, PVP/AM film, glass transition temperature (Tg), thermal stability,
Abstract :
Novel nanocomposite films based on amylose (AM) and Fe3+-montmorillonite (Fe3+MMT) in the matrix of poly (vinyl pyrrolidone) (PVP) were fabricated by using a solution casting method. The X-Ray diffractional analysis indicated that an ion-exchange process occurred between Fe3+MMT and PVP. Thermogravimetrical analysis (TGA), differential termogravivetrical analysis (DTG), Scanning Electron microscopy (SEM) and differential scanning calorimetry (DSC) results hinted to PVP/AM films forming a stabler network through the dispersion of Fe3+ cations. An increase in the loading of Fe3+MMT improved the hydrophilic properties of PVP/AM films, which lead to the high degree of resistance against on the water absorption. Mechanical properties of PVP/AM films influenced by the uniform dispersion of Fe3+MMT in polymer network established with strong covalent interactions between PVP/AM and Fe3+MMT. This interaction not only improved the mechanical properties of the films, but also enhanced the thermal stability of them through the facilitating of the MMT dispersion within the polymer matrix.