Biodegradable foams based on starch, polyvinyl alcohol, chitosan and sugarcane fibers obtained by extrusion

Brazilian Archives of Biology and Technology

Flávia Debiagi²  Suzana Mali²  Maria Victória Eiras Grossmann¹  Fábio Yamashita¹ 

[1] ,Universidade Estadual de Londrina Centro de Ciências Exatas Departamento de Bioquímica e BiotecnologiaLondrina PR ,Brasil

关键词: cassava starch;    mechanical properties;    microstructure;    expansion;   

DOI  :  10.1590/S1516-89132011000500023

来源: SciELO

【 摘 要 】

Biodegradable foams made from cassava starch, polyvinyl alcohol (PVA), sugarcane bagasse fibers and chitosan were obtained by extrusion. The composites were prepared with formulations determined by a constrained ternary mixtures experimental design, using as variables: (X1) starch / PVA (100 - 70%), (X2) chitosan (0 - 2%) and (X3) fibers from sugar cane (0 - 28%). The effects of varying proportions of these three components on foam properties were studied, as well the relationship between their properties and foam microstructure. The addition of starch/PVA in high proportions increased the expansion index and mechanical resistance of studied foams. Fibers addition improved the expansion and mechanical properties of the foams. There was a trend of red and yellow colors when the composites were produced with the highest proportions of fibers and chitosan, respectively. All the formulations were resistant to moisture content increase until 75% relative humidity of storage.

【 授权许可】

CC BY-NC   
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