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

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

Carbohydrate polymers (2013-02-13)
J B Olivato, M M Nobrega, C M O Müller, M A Shirai, F Yamashita, M V E Grossmann
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
L-(+)-Tartaric acid, puriss. p.a., reag. ISO, 99.5-101.0% (calc. to the dried substance)
Sigma-Aldrich
L-(+)-Tartaric acid, ACS reagent, ≥99.5%
Sigma-Aldrich
D-(−)-Tartaric acid, puriss., unnatural form, ≥99.0% (T)
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L-(+)-Tartaric acid, ≥99.7%, FCC, FG
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L-(+)-Tartaric acid, ≥99.5%
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D-(−)-Tartaric acid, ReagentPlus®, 99%
Sigma-Aldrich
L-(+)-Tartaric acid, puriss., meets analytical specification of Ph. Eur., NF, 99.7-100.5% (calc. to the dried substance), powder
Supelco
L-(+)-Tartaric acid, certified reference material, TraceCERT®, Manufactured by: Sigma-Aldrich Production GmbH, Switzerland
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L-(+)-Tartaric acid, BioXtra
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L-(+)-Tartaric acid, anhydrous, free-flowing, Redi-Dri, ACS reagent, ≥99.5%
Sigma-Aldrich
DL-Tartaric acid, ≥99%
Sigma-Aldrich
DL-Tartaric acid, ReagentPlus®, 99%