PVA/polysaccharides blended films: mechanical properties
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2013
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Blends of polyvinyl alcohol (PVA) and angico gum (AG) and/or cashew gum (CG) were used to produce films by casting method.
Morphological and mechanical properties of these films were studied and compared to the properties of a commercial collagen
membrane of bovine origin (MBO). The films presented thickness varying from 70 to 140 μm (PVA/AG) and 140 to 200 μm
(PVA/CG). Macroscopic analysis showed that a PVA/CG film was very similar to MBO regarding the color and transparency.
The higher values of tensile strength (TS) and elastic modulus (EM) were observed in the PVA/AG HCl film. On the other hand,
PVA/CG and PVA/CG-AG presented the highest value of percentage of elongation (E%). Pearson’s Correlation Analysis revealed a
positive correlation (r = 0.83) between TS and EM and a negative correlation (r = −0.79) between E% and EM. The PVA/CG film
presented mechanical properties very similar to MBO, with the advantage of a higher E% (11.96) than MBO (2.94). The properties
of the PVA blended films depended on the polysaccharide added in the blend, as well as the acid used as a catalyst. However, all
produced films presented interesting mechanical characteristics which enables several biotechnological applications.
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SILVA, Fábio E. F. et al. PVA/polysaccharides blended films: mechanical properties. Journal of Materials, London, v. 2013, p. 1-6, 2013.