Comparing the microstructure, topography and surface hydrophilicity of starch polyvinyl alcohol based films containing nanoclay and cellulose nanocrystal

Document Type : Research Paper


1 Associated Professor, Faculty of Agriculture, University of Tabriz, Iran

2 M. Sc. Student. Faculty of Agriculture, University of Tabriz, Iran


The main objectives of this research were the study and comparing the microstructure of PVA-STNCC
and PVA-ST-MMT by X ray diffraction and atomic force microscopy (AFM) and as well as,
comparing the effects of two nanoparticle on surface hydrophilicity and moisture absorption. X
diffraction patterns showed that microstructure of the PVA-ST-MMT films was exfoliated and
PVA-ST-NCC was closer to intercalated structure. The AFM phase images showed good dispersion
of nanoparticle in matrix and there wasn’t observed any agglomeration in the phase images of the
both films. Comparing the three dimensional topographic images, height distribution point’s curves
and roughness parameters showed that MMT produce rougher film in comparison with NCC.
Adding MMT and NCC increased the contact angle of film and there isn’t significant difference
between MMT and NCC on increasing the contact angle. The water absorption of the films
decreased with adding MMT and NCC however, MMT caused higher decrease in comparison to
NCC. Comparing the color parameters showed that adding two nano reinforcements didn’t affect
the transparency of starch-PVA bionanocomposites however, increased the yellow color of the


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