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|Title:||In-vitro degradation behaviour of starch/EVOH biomaterials|
|Author(s):||Araújo, M. Alberta|
Vaz, Cláudia M.
Cunha, A. M.
Starch/poly (ethylene-vinyl alcohol)
|Citation:||Araújo, M. Alberta; Vaz, C. M.; Reis, R. L.; A. M. Cunha; Mota, M., In-vitro degradation behaviour of starch/evOH biomaterials. I Iberian Congress on Biomaterials and Biosensors. Avila, Spain, September, 2000.|
|Abstract(s):||Blends of corn starch with poly(ethylene-vinyl alcohol) copolymer (SEVA-C) were aged up to 30 days and the degradation solutions were analysed by several techniques. The changes in the mechanical properties as a function of the immersion time can be characterised by an increase in the ductility and a decrease in the stiffness. Weight loss and water uptake were also evaluated. The morphology and the water absorption capacity of SEVA-C were followed by scanning electron microscopy (SEM) and thermogravimetric analysis (TGA), respectively. The degradation solutions were monitored with anionic chromatography (HPAE-PAD), colorimetric methods and Fourier transformed infra-red spectrophotomety (FT-IR). In the first days of immersion, the released of almost the plasticisers added to the material formulation, mainly glycerol, was the main physical phenomenon. The total polysaccharides increased in solution as a function of immersion time, as a consequence of the chemical degradation. SEVA-C micrographs presented an increase in the surface porosity as a function of immersion time.|
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