Degradation during processing of vegetable fiber compounds based on PBAT/PHB blends

Costa, Anna Raffaela M.; Reul, Lizzia Tanira Albuquerque; Sousa, Fernanda M.; Ito, Edson N.; Carvalho, Laura H.; Canedo, Eduardo L.

doi:10.1016/j.polymertesting.2018.05.031

Cited by 26 publications

(13 citation statements)

References 25 publications

(34 reference statements)

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“…By changing the composition of the mixture, materials with suitable properties for various applications can be obtained. To improve ductility, PHB has been mixed with polymers characterized by high toughness and low glass transition temperature (T g ) values, as for example poly(ethylene oxide), 8 poly(ε-caprolactone), 9 poly(butylene succinate) (PBS), [10][11][12][13] poly[(butylene succinate)-co-(butylene adipate)] (PBSA), 14 poly[(butylene adipate)-co-(butylene terephthalate)] 15 and poly(propylene carbonate). 16 In particular, PBS is a very interesting aliphatic polyester, because it can be biobased as PHB, besides being biodegradable, as well as the copolymers PBSA.…”

Section: Introductionmentioning

confidence: 99%

Immiscible PHB/PBS and PHB/PBSA blends: morphology, phase composition and modelling of elastic modulus

Righetti

Cinelli

Aliotta

et al. 2021

Polymer International

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This paper reports the thermal, morphological and mechanical properties of environmentally friendly poly(3-hydroxybutyrate) (PHB)/poly(butylene succinate) (PBS) and PHB/poly[(butylene succinate)-co-(butylene adipate)] (PBSA) blends, prepared by melt mixing. The blends are known to be immiscible, as also confirmed by the thermodynamic analysis here presented. A detailed quantification of the crystalline and amorphous fractions was performed, in order to interpret the mechanical properties of the blends. As expected, the ductility increased with increasing PBS or PBSA amount, but in parallel the decrease in the elastic modulus appeared limited. Surprisingly, the elastic modulus was found properly described by the rule of mixtures in the whole composition range, thus attesting mechanical compatibility between the two blend components. This unusual behavior has been explained as due to co-continuous morphology, present in a wide composition range, but also at the same time as the result of shrinkage occurring during sequential crystallization of the two components, which can lead to physical adhesion between matrix and dispersed phase. For the first time, the elastic moduli of the crystalline and mobile amorphous fractions of PBS and PBSA and of the mobile amorphous fraction of PHB at ambient temperature have been estimated through a mechanical modelling approach.

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Section: Introductionmentioning

confidence: 99%

Immiscible PHB/PBS and PHB/PBSA blends: morphology, phase composition and modelling of elastic modulus

Righetti

Cinelli

Aliotta

et al. 2021

Polymer International

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“…where: k is a constant; T is the experimental working temperature; T 0 is a reference temperature. However, in general, average values are adopted in a small stable time interval to minimize torque and temperature fluctuations in the final processing stage [45].…”

Section: Resultsmentioning

confidence: 99%

DETERMINATION OF THE VISCOSITY TEMPERATURE COEFFICIENT (β) AND PSEUDOPLASTIC INDEX (n) OF POLY(LACTID ACID) (PLA)

Luna

Ferreira

Sousa

et al. 2022

Momento

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Poly(lactic acid) (PLA) is one of the most important ecological thermoplastics due to its good mechanical properties. In light of this, investigations related to the effects of PLA processing parameters are important as they affect the final product performance. This work aimed to determine the viscosity-temperature coefficient (β) and pseudoplastic index (n) of PLA and estimate its degradation rate during processing using an internal mixer. The viscosity coefficient was determined applying different processing temperatures at the same rotors rotation rate, which allowed estimating β = 0.048 ◦C−1. PLA’s pseudoplastic index (n) under the tested conditions suggested a value of approximately 0.71. PLA’s degradation rate was around 4% under rotor rate of 120 rpm and temperature of 190 ◦C.

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“…PBAT has been blended with PHB and natural fibers [15,16], and with PHBV [16,17]. Also, PBAT blended with PLA has been described [18][19][20], with polylactide-poly(butylene adipate-co-terephthalate)-polylactide tri-block copolymers incorporating PLA blocks (LPB and HPB) as compatibilizers [18].…”

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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Degradation during processing of vegetable fiber compounds based on PBAT/PHB blends

Cited by 26 publications

References 25 publications

Immiscible PHB/PBS and PHB/PBSA blends: morphology, phase composition and modelling of elastic modulus

Immiscible PHB/PBS and PHB/PBSA blends: morphology, phase composition and modelling of elastic modulus

DETERMINATION OF THE VISCOSITY TEMPERATURE COEFFICIENT (β) AND PSEUDOPLASTIC INDEX (n) OF POLY(LACTID ACID) (PLA)

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

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