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Materiale Plastice (Mater. Plast.), Year 2010, Volume 47, Issue 4,





Doina Dimonie, Ivan Kelnar, Radu Socoteanu, Raluca Nicoleta Darie, Florentina Simona Pop, Catalin Zaharia, Celina Petrea, Monica Nemteanu, Ramona Marina Coserea The Influence of Miscibility and Micro - structure on the Surface Defects of some Starch Bio - Hybrides


Abstract:
The paper presents the effects of the miscibility and of the micro-structure on the surface defects of some bio - hybrides based on starch, polyvinyl alcohol (PVOH) and multilayered silicates. At macroscopic level (100m) the studied starch bio-hybrids seem to be compact materials. If these materials are analysed at a microscopic level (10 m) depending on their type surface defects like voids, cracks and fractures can be observed. These defects are not a consequence of a poor miscibility, even in case of bio-hybrids that contain untreated silicate. These defects appear because of the bio-hybrids micro-structure. As the new bio - hybrids are probably disorderly ones, it can be estimated that the surface defects appear as a consequence of a poor distribution of the swollen silicate tectoids into the polymeric matrix, possibly as a consequence of the improper melt processing conditions. Keywords: polyvinyl alcohol, starch, multilayered silicate, surface defects, miscibility, bio-hybrides, micro-structure



Issue: 2010 Volume 47, Issue 4
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