Propriedades físicas de filmes biodegradáveis à base de amido de mandioca, álcool polivinílico e montmorilonita

• Main Authors: Fernando de Oliveira Faria, Ana Elisa Stefani Vercelheze, Suzana Mali
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2012-01-01
• Series: Química Nova
• Subjects: microstructure; mechanical properties; sodium montmorillonite
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422012000300009&lng=en&tlng=en

The objective of this work was to manufacture biodegradable films based on cassava starch, polyvinyl alcohol (PVA) and sodium montmorillonite (Na-MMT), using glycerol as a plasticizer. These films were characterized according to their microstructure, optical, mechanical, and barrier properties. The combination of starch-PVA-MMT resulted in films with a more homogeneous surface than starch films. The introduction of PVA into the starch matrix led to the formation of films with lower water vapor permeability (WVP), higher tensile strength and greater elongation. MMT was exfoliated in the films, resulting in greater stability for different relative humidities, lower WVP, higher resistance and lower flexibility.