Mixture design applied for the development of films based on starch, polyvinyl alcohol, and glycerol

ABSTRACT Starch and polyvinyl alcohol (PVA) are biodegradable materials with potentiality to replace the conventional polymers in some applications. The aim of this work was to produce biodegradable films of PVA, cassava starch, and glycerol by thermoplastic extrusion using a mixture design to evalu...

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Bibliographic Details
Published in:Journal of applied polymer science 2015-11, Vol.132 (43), p.n/a
Main Authors: Zanela, Juliano, Olivato, Juliana Bonametti, Dias, Adriana Passos, Grossmann, Maria Victória Eiras, Yamashita, Fabio
Format: Article
Language:English
Subjects:
biopolymers and renewable polymers
extrusion
Materials science
mechanical properties
Polymers
thermoplastics
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Summary:ABSTRACT Starch and polyvinyl alcohol (PVA) are biodegradable materials with potentiality to replace the conventional polymers in some applications. The aim of this work was to produce biodegradable films of PVA, cassava starch, and glycerol by thermoplastic extrusion using a mixture design to evaluate the effects of each component in the blend properties. Six formulations were prepared using a twin‐screw extruder coupled with a calender. All the materials were visually homogeneous and presented good processability. Mechanical properties were dependent on both the relative humidity conditioning and the formulation; higher relative humidities detracted the mechanical properties, which was associated to plasticizer effect of the water. Furthermore, the mechanical properties were better when higher concentrations of PVA were used, resulting in films with lower opacity, lower water vapor permeability, and higher thermal stability, according to TGA. Biodegradable materials based on starch, PVA, and glycerol have adequate mechanical and processing properties for commercial production. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42697.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.42697