Study of the compatibilizer effect in the properties of starch / polyester blends

Olivato, Juliana Bonametti; Müller, Carmen Maria Olivera; Yamashita, Fábio; Grossmann, Maria Victória Eiras; Nobrega, Marcelo M.

doi:10.4322/polimeros.2013.014

Cited by 17 publications

(19 citation statements)

References 25 publications

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“…Besides this, the retrogradation and crystallization of the mobile starch chains change its mechanical and barrier properties [6]. As a result, TPS is often blended with other polymers, such as poly(butylene adipate-co-terephthalate) (PBAT) and biodegradable aliphatic-aromatic copolyester, which combines biodegradability with other desirable physical properties [7]. However, it is expensive to produce, which limits its use on a wider scale [8].…”

Section: Introductionmentioning

confidence: 99%

PBAT/TPS Composite Films Reinforced with Starch Nanoparticles Produced by Ultrasound

Silva

Correia

Druzian

et al. 2017

International Journal of Polymer Science

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The objective of the present work was to study the incorporation of starch nanoparticles (SNP) produced by ultrasound in blends of poly(butylene adipate-co-terephthalate) (PBAT) and thermoplastic starch (TPS). The films were produced by extrusion using varying percentages of SNP (1, 2, 3, 4, and 5% w/w). The SNP were prepared in water without the addition of any chemical reagent. The results revealed that ultrasound treatment results in the formation of SNP less than 100 nm in size and of an amorphous character and lower thermal stability and low gelatinization temperature when compared with cassava starch. Scanning electron microscopy (SEM) showed that films presented some starch granules. The relative crystallinity (RC) of films decreases with increasing concentration of SNP. The addition of SNP slightly affected the thermal degradation of the films. The DSC results showed that the addition did not modify the interaction between the different components of the films. Mechanical tests revealed an increase in Young's modulus (36%) and elongation-at-break (35%) with the incorporation of 1% SNP and this concentration reduced the water vapor permeability (53%) and significantly decreased the water absorption of the films, demonstrating that low concentrations of SNP can be used as reinforcement in a polymeric matrix.

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Section: Introductionmentioning

confidence: 99%

PBAT/TPS Composite Films Reinforced with Starch Nanoparticles Produced by Ultrasound

Silva

Correia

Druzian

et al. 2017

International Journal of Polymer Science

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“…polylactic acid-grafted maleic anhydride [8]. Among the suitable blend partners of TPS, poly(butylene adipate-co-terephthalate) (PBAT) belongs to the most favored polymers since it combines biodegradability with other desirable physical properties, especially flexibility, unlike rather brittle PLA [9].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and structure of mixtures of poly(butylene-adipate-co-terephthalate) (PBAT) with thermoplastic starch (TPS)

Lackner

Ivanič

Kováčová

et al. 2021

International Journal of Biobased Plastics

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Mixtures of poly(butylene-adipate-co-terephthalate) (PBAT) with thermoplastic starch (TPS) in a broad concentration range from 70:30 to 30:70 wt.% were prepared in a twin-screw extruder. Mechanical properties were tested, showing that the addition of TPS leads to a substantial decrease in the tensile strength as well as in the elongation at break, while Young's modulus is rising substantially. Additional data were collected by dynamic mechanical thermal analysis (DMTA) and scanning electron microscopy (SEM), enabling a more detailed discussion on relations between ultimate properties and structural parameters. The application potential of biodegradable PBAT/TPS blends consists mainly in the substitution of polyethylene in packagings, where the material investigated is also economically competitive. The main advantage of adding TPS to PBAT is increasing the biobased carbon content cost-effectively, since most PBAT on the market is fossil-based.

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“…PLA is both biodegradable and entirely renewable as it originates from starch. It is film blowable, making it interesting for consumer packaging, although it suffers due to its limitations in terms of its brittleness during film blowing and its hygroscopic behavior [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. PBAT is a random copolymer of butylene adipate and terephthalate, which has shown to be fully biodegradable when composted [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Chain-Extending Cross-Linkers on the Mechanical and Thermal Properties of Poly(butylene adipate terephthalate)/Poly(lactic acid) Blown Films

et al. 2021

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This study investigates the effects of four multifunctional chain-extending cross-linkers (CECL) on the processability, mechanical performance, and structure of polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA) blends produced using film blowing technology. The newly developed reference compound (M·VERA® B5029) and the CECL modified blends are characterized with respect to the initial properties and the corresponding properties after aging at 50 °C for 1 and 2 months. The tensile strength, seal strength, and melt volume rate (MVR) are markedly changed after thermal aging, whereas the storage modulus, elongation at the break, and tear resistance remain constant. The degradation of the polymer chains and crosslinking with increased and decreased MVR, respectively, is examined thoroughly with differential scanning calorimetry (DSC), with the results indicating that the CECL-modified blends do not generally endure thermo-oxidation over time. Further, DSC measurements of 25 µm and 100 µm films reveal that film blowing pronouncedly changes the structures of the compounds. These findings are also confirmed by dynamic mechanical analysis, with the conclusion that tris(2,4-di-tert-butylphenyl)phosphite barely affects the glass transition temperature, while with the other changes in CECL are seen. Cross-linking is found for aromatic polycarbodiimide and poly(4,4-dicyclohexylmethanecarbodiimide) CECL after melting of granules and films, although overall the most synergetic effect of the CECL is shown by 1,3-phenylenebisoxazoline.

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Study of the compatibilizer effect in the properties of starch / polyester blends

Cited by 17 publications

References 25 publications

PBAT/TPS Composite Films Reinforced with Starch Nanoparticles Produced by Ultrasound

PBAT/TPS Composite Films Reinforced with Starch Nanoparticles Produced by Ultrasound

Mechanical properties and structure of mixtures of poly(butylene-adipate-co-terephthalate) (PBAT) with thermoplastic starch (TPS)

The Effects of Chain-Extending Cross-Linkers on the Mechanical and Thermal Properties of Poly(butylene adipate terephthalate)/Poly(lactic acid) Blown Films

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