Citric acid and maleic anhydride as compatibilizers in starch/poly(butylene adipate-co-terephthalate) blends by one-step reactive extrusion |
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Authors: | J.B. Olivato M.V.E. GrossmannF. Yamashita D. EirasL.A. Pessan |
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Affiliation: | a Departamento de Ciência e Tecnologia de Alimentos, Centro de Ciências Agrárias, Universidade Estadual de Londrina, Cx. Postal 6001, 86051-980 Londrina, PR, Brazil b Laboratório de Permeação e Sorção, Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, CP 780, 13560-970 São Carlos, SP, Brazil |
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Abstract: | Starch/poly(butylene adipate-co-terephthalate) films were obtained by one-step reactive extrusion using maleic anhydride (MA) and citric acid (CA) as compatibilizers. The mechanical, structural, optical and barrier properties of the films were analyzed when glycerol (GLY), CA and MA were added to the starch/PBAT (55:45, w/w) according to mixture design. FTIR analysis showed that CA and MA were able to promote esterification/transesterification reactions and that CA induced them more efficiently. When a greater proportion of compatibilizer (1.5 wt%) was used, the resulting films were more opaque and had a greater tensile strength. A greater proportion of GLY (10.0%, w/w) improved the elongation at the break of the films. The barrier properties to water vapor of the films were improved by high levels of CA (1.5 wt%) and intermediate levels of GLY (9.25 wt%). The inclusion of compatibilizers resulted in blends with improved properties, representing a potential replacement for non-biodegradable films. |
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Keywords: | Reactive extrusion Compatibilizers Starch Citric acid Maleic anhydride |
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