Degradation and recovery in poly(butylene adipate-co-terephthalate)/ thermoplastic starch blends

Marinho, Vithória A. D.; Pereira, Camila Ariana Becker; Vitorino, Maria B. C.; Silva, Aline S.; Carvalho, Laura H.; Canedo, Eduardo L.

doi:10.1016/j.polymertesting.2016.12.028

Cited by 57 publications

(26 citation statements)

References 33 publications

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“…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]. When starch and PBAT are mixed on the other hand, the cost is lower and 2 International Journal of Polymer Science their degradability properties are increased.…”

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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“…The rate of degradation during processing can be estimated from the results obtained in the last processing step. Since the adjusted torque is temperature‐independent, for tests performed at constant rotor speed, the adjusted torque change over time can be attributed to a change in the molecular mass of the matrix that may be associated with the incipient degradation of the polymer matrix during processing.…”

Section: Methodsmentioning

confidence: 99%

Polycaprolactone (PCL)/alumina and PCL/niobium pentoxide composites: Rheology, crystallization, and mechanical properties

et al. 2019

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Polymeric polycaprolactone (PCL) matrix composites reinforced with alumina and niobium pentoxide were prepared in a laboratory internal mixer and studied by differential scanning calorimetry (DSC), tensile and impact tests, in addition to the particle distribution in the matrix. The objective of this study was to evaluate the influence of the oxide content on the rheology, crystallization, and mechanical properties of these composites. According to the rheological analysis, the composites were well mixed and the polymer matrix used in the composites can be considered thermally stable during processing. The effect of the fillers on degradation during processing was minimal. DSC analyses indicate that, in general, the increase in the filler content does not change the crystallization temperature, irrespectively of the oxide added. For the niobium pentoxide composites, crystallinity does not appear to be affected by an increase in filler content or cooling rate. Both tensile strength and elongation at break decreased with filler addition while impact strength decreased and Young's modulus was apparently unaffected. There was good distribution of the oxide particles in the polymer matrix.

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“…and it may be considered a valid measure of the polymer stability during processing. R z is approximately proportional to the rate of change of the mass-average molar mass (Marinho et al, 2017): Figure 6 graphically shows the effect of the clay content and rotor speed (proportional to the rate of deformation) on adjusted torque (proportional to melt viscosity) and rate of adjusted torque decrease (proportional to the rate of degradation), evaluated as described in the Experimental section, during the last third (10-15 min) processing time. Results (Figure 6a) show that organoclay incorporation did not affect melt viscosity, not even at high rotor speed, a finding consistent with the behavior of low loading level isomet-ric microcomposites, suggesting that nanodispersion was nor achieved during processing in the internal mixer.…”

Section: Torque Rheometrymentioning

confidence: 99%

Rheological characteristics PBAT/organoclay compounds

et al. 2019

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The rheological behavior of poly (butylene adipate-co-terephthalate) (PBAT) and its composites prepared with three different organoclays was investigated. Composites containing up to 7.5%, w/w organoclay, were prepared by two routes: (a) direct melt blending in an internal laboratory mixer with high intensity rotors and (b) concentrates (prepared in the internal mixer) with 50 %, by weight, of the organoclays diluted in a co-rotating twin screw extruder equipped with a high intensity mixing thread operating at a nominal speed of 480 rpm. The samples were characterized by both torque and parallel plate rheometry. Results indicate that nanodispersions in the clay layers were obtained during processing and that, like the pure matrix, at high shear rates, the organoclay compounds follow the power law, although with higher viscosity. It is believed that the interaction of the polymer with the organoclay is responsible for the increase in melt viscosity (observed by increases in torque and relaxation time) of the hybrid systems.

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Degradation and recovery in poly(butylene adipate-co-terephthalate)/ thermoplastic starch blends

Cited by 57 publications

References 33 publications

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

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

Polycaprolactone (PCL)/alumina and PCL/niobium pentoxide composites: Rheology, crystallization, and mechanical properties

Rheological characteristics PBAT/organoclay compounds

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