Modeling of the properties of plasticized poly(3-hydroxybutyrate) as a function of aging time and plasticizer content

Umemura, Rodrigo T.; Felisberti, Maria I.

doi:10.1016/j.mtcomm.2020.101439

Cited by 7 publications

(25 citation statements)

References 35 publications

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“…Moreover, they performed tensile tests 30 days after injection molding, while we performed the tensile tests 60 days after processing. As reported earlier, 31 the physical and mechanical properties of PHB and PHB plasticized with TEC changes continuously in a period of 90 days. Thus, these differences in the mechanical properties may be due to aging history.…”

Section: Resultssupporting

confidence: 71%

“…Moreover, its properties may be adjusted by blending with other polymers [17][18][19][20][21] and the use of polymer additives as nucleating additives 22 and plasticizers. [23][24][25][26][27][28][29][30] The main drawbacks that hinder the wide application of PHB are its high stiffness and brittleness imparted by physical aging [31][32][33][34] and the narrow processability window due to degradation temperature close the melting. 35 Several strategies have been used to overcome these barriers, such as the addition of nucleating agents, which increase crystallization rate and reduce spherulite size 22 ; the copolymerization of 3-hydroxybutyrate with other comonomers such as hydroxyvalerate and hydroxyhexanoate, 36 which generates copolymers with increased toughness; and the usage of external plasticizers.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of TEC accelerates the PHB crystallization, reducing the deleterious effect of the physical aging. 31 In the present work, we studied the overall properties of the formulations, focusing on the crystallization behavior and the morphological changes imparted by the progress of the crystallization and the presence of TEC. Besides, we study the processability, mechanical properties, thermal properties, dynamic-mechanical properties, and morphological properties of PHB formulations containing variable amounts of TEC.…”

Section: Introductionmentioning

confidence: 99%

“…The main drawbacks that hinder the wide application of PHB are its high stiffness and brittleness imparted by physical aging 31–34 and the narrow processability window due to degradation temperature close the melting 35 …”

Section: Introductionmentioning

confidence: 99%

“…In previous work, we studied the physical aging of PHB plasticized with TEC. The presence of TEC accelerates the PHB crystallization, reducing the deleterious effect of the physical aging 31 . In the present work, we studied the overall properties of the formulations, focusing on the crystallization behavior and the morphological changes imparted by the progress of the crystallization and the presence of TEC.…”

Section: Introductionmentioning

confidence: 99%

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Plasticization of poly(3‐hydroxybutyrate) with triethyl citrate: Thermal and mechanical properties, morphology, and kinetics of crystallization

Umemura

Felisberti

2020

J of Applied Polymer Sci

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Poly(3-hydroxybutyrate) (PHB), is one important biopolymer and a promising alternative to petroleum-based plastics. In this article, formulations of PHB and triethyl citrate (TEC) as plasticizer were prepared by melt extrusion. The effect of TEC on the mechanical, thermal, and morphological properties of PHB was investigated by tensile tests, impact resistance, dynamic-mechanical analysis, differential scanning calorimetry, polarized optical microscopy, and small-and wide-angle X-ray scattering. TEC acted as an efficient plasticizer for PHB, imparting gradual changes in the properties as the mass fraction of TEC increased. A reduction in the elastic modulus, an increase in the intensity of β relaxation indicated a higher capacity of mechanical energy dissipation for the formulations containing higher mass fractions of TEC. TEC reduced its glass transition and melting temperatures, contributing to the increase of the processing window of the temperature and minimizing thermal degradation of PHB. TEC had a strong influence on the kinetics of crystallization, the morphology of the spherulites, and the crystalline structural parameters, such as long period, crystalline lamella, and interlamellar amorphous region thicknesses. Our study clarifies how the morphology of the PHB crystalline phase evolves in the presence of the plasticizer and with the time of crystallization.

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Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Plasticization of poly(3‐hydroxybutyrate) with triethyl citrate: Thermal and mechanical properties, morphology, and kinetics of crystallization

Umemura

Felisberti

2020

J of Applied Polymer Sci

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Green composites of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) and sugarcane bagasse fibers plasticized with triethyl citrate: Thermal, mechanical and morphological properties

Ferrão

Perin

Felisberti

2022

J of Applied Polymer Sci

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In this work, PHBV composites were prepared by melting extrusion using triethyl citrate (TEC) as a biodegradable plasticizer and sugarcane bagasse fibers (SBF) as reinforcement. The plasticizer TEC played a crucial role in the preparation of the formulations by extrusion, reducing the viscosity of the melt and minimizing the thermomechanical degradation of PHBV. Moreover, TEC was an efficient plasticizer for the composites, reducing the glass transition and melting temperatures of PHBV and making the specimens ductile. The increase in the concentration of TEC led to an enlargement of the interlamellar spacing and larger PHBV spherulites without changing the cell parameters. In contrast, the introduction of the SBF elevated the viscosity of the molten during extrusion, leading to thermomechanical degradation of PHBV. The SBF acted as a nucleation agent for the PHBV crystallization and oriented the growth of the PHBV crystals due to the transcrystallization, which contributed to the matrix-filler adhesion, the increase in the lamellae thickness, and changes in the thermal properties of PHBV. The SBF acted as a reinforcing agent, increasing the tensile properties of the matrix. Therefore, TEC and SBF had antagonistic effects on the properties of the formulations, opening opportunities to tune their properties by varying the composition.

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Developments of biobased plasticizers for compostable polymers in the green packaging applications: A review

Alhanish

Ghalia

2021

Biotechnology Progress

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The demand for biobased materials for various end‐uses in the bioplastic industry is substantially growing due to increasing awareness of health and environmental concerns, along with the toxicity of synthetic plasticizers such as phthalates. This fact has stimulated new regulations requiring the replacement of synthetic conventional plasticizers, particularly for packaging applications. Biobased plasticizers have recently been considered as essential additives, which may be used during the processing of compostable polymers to enormously boost biobased packaging applications. The development and utilization of biobased plasticizers derived from epoxidized soybean oil, castor oil, cardanol, citrate, and isosorbide have been broadly investigated. The synthesis of biobased plasticizers derived from renewable feedstocks and their impact on packaging material performance have been emphasized. Moreover, the effect of biobased plasticizer concentration, interaction, and compatibility on the polymer properties has been examined. Recent developments have resulted in the replacement of synthetic plasticizers by biobased counterparts. Particularly, this has been the case for some biodegradable thermoplastics‐based packaging applications.

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Modeling of the properties of plasticized poly(3-hydroxybutyrate) as a function of aging time and plasticizer content

Cited by 7 publications

References 35 publications

Plasticization of poly(3‐hydroxybutyrate) with triethyl citrate: Thermal and mechanical properties, morphology, and kinetics of crystallization

Plasticization of poly(3‐hydroxybutyrate) with triethyl citrate: Thermal and mechanical properties, morphology, and kinetics of crystallization

Green composites of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) and sugarcane bagasse fibers plasticized with triethyl citrate: Thermal, mechanical and morphological properties

Developments of biobased plasticizers for compostable polymers in the green packaging applications: A review

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