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PVA/Polysaccharides Blended Films: Mechanical Properties

2013; Hindawi Publishing Corporation; Volume: 2013; Linguagem: Inglês

10.1155/2013/413578

2314-4874

Fábio E. F. Silva, Maria Carolina Bezerra Di Medeiros Leal, Karla de Aleluia Batista, Kátia Flávia Fernandes,

Natural Fiber Reinforced Composites

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 μ m (PVA/AG) and 140 to 200 μ m (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 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 between TS and EM and a negative correlation 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.