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Research Article
Poly (vinyl alcohol) and casein films: The effects of glycerol amount on the properties of films
Bedriye Ucpinar Durmaz1, Ayse Aytac*,1,2
1Department of Chemical Engineering, Kocaeli University, Kocaeli, Turkey
2Polymer Science and Technology Program, Kocaeli University, Kocaeli, Turkey
Keywords
Abstract
Casein;
Poly (vinyl alcohol);
Glycerol;
Plasticization
The aim of the present work was to investigate
the effect of glycerol (GLY) concentration on the properties of poly (vinyl
alcohol) (PVA)/casein (CAS) blend films. The films were prepared by solution
casting method at the different concentrations of GLY. The structural,
mechanical, thermal, barrier and hydrophilic-hydrophobic properties of the
films were determined by various methods. The structural analysis indicated
that there were some interactions between the components. Tensile test results
release that tensile strength of the film decreased with the addition of GLY
while strain at break values increased. According to thermogravimetric analysis
(TGA) results, the GLY included films exhibited lower thermal stability than
GLY-0 film. The residual weight decreased
by increasing GLY content. The contact
angle measurements showed that all films were hydrophilic structure. Also, the
water vapor barrier property of the GLY-0 film was developed with the addition
of GLY.
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