Mixture design applied for the study of the tartaric acid effect on starch/polyester films.

Autor: Olivato JB; Departamento de Ciência e Tecnologia de Alimentos, Centro de Ciências Agrárias, Universidade Estadual de Londrina, PO Box 6001, 86051-980 Londrina, PR, Brazil. jubonametti@uel.br, Nobrega MM, Müller CM, Shirai MA, Yamashita F, Grossmann MV
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2013 Feb 15; Vol. 92 (2), pp. 1705-10. Date of Electronic Publication: 2012 Nov 17.
DOI: 10.1016/j.carbpol.2012.11.024
Abstrakt: Tartaric acid (TA), a dicarboxylic acid, can act as a compatibiliser in starch/polyester blends. A mixture design was proposed to evaluate the effect of TA on the properties of starch/poly (butylene adipate co-terephthalate) (PBAT) blown films plasticised with glycerol. The interaction between the starch/PBAT and the TA has a positive effect on the tensile strength and puncture force. Additionally, greater proportions of TA increased Young's modulus. The starch+PBAT/TA and Gly/TA interactions contributed to a reduction in the water vapour permeability of the films. The inclusion of TA did not change the crystallinity of the samples. Formulations with intermediate proportions of TA (0.8 g/100 g) were shown to produce the best compatibilising effect. This was observed by DMA analysis as a consequence of the perfect equilibrium between the contributions of TA as a compatibiliser and in the acidolysis of starch, resulting in films with a tensile strength of 5.93 MPa, a possible alternative to non-biodegradable packaging.
(Copyright © 2012 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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