title: Mixture design applied for the study of the tartaric acid effect on starch/polyester films.
abstract: 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.
authors: 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
authors: J B
authors: JB
authors: Olivato
authors: M M
authors: MM
authors: Nobrega
authors: C M O
authors: CM
authors: Müller
authors: M A
authors: MA
authors: Shirai
authors: F
authors: F
authors: Yamashita
authors: M V E
authors: MV
authors: Grossmann
mesh_terms: D005990:Glycerol / Q000737:chemistry; D055595:Mechanical Phenomena; D010539:Permeability; D011091:Polyesters / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D013644:Tartrates / Q000737:chemistry*; D013696:Temperature; D014835:Volatilization; D014867:Water / Q000737:chemistry
chemical_list: D011091:Polyesters; D013644:Tartrates; C488797:poly(butylene adipate-co-butylene terephthalate); D014867:Water; D013213:Starch; D005990:Glycerol; C029768:tartaric acid