Thermal, thermo-oxidative and thermomechanical degradation of PLA: A comparative study based on rheological, chemical and thermal properties

Cuadri, A.A.; Martín‐Alfonso, J.E.

doi:10.1016/j.polymdegradstab.2018.02.011

Cited by 99 publications

(113 citation statements)

References 38 publications

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“…It can occur when the polymer is extruded at around 200 • C near the melting point or below [52]. Therefore, the main changes in the characteristic absorption bands for the FTIR spectra occurred at 1750 cm −1 due to stretching of carbonyl group demonstrating the possible chain scission of PLA at around 200 • C [53].…”

Section: Fourier Transform Infrared Spectroscopy-attenuated Total Refmentioning

confidence: 99%

Preparation and Characterization of Bio-Based PLA/PBAT and Cinnamon Essential Oil Polymer Fibers and Life-Cycle Assessment from Hydrolytic Degradation

et al. 2019

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Nowadays, the need to reduce the dependence on fuel products and to achieve a sustainable development is of special importance due to environmental concerns. Therefore, new alternatives must be sought. In this work, extruded fibers from poly (lactic acid) (PLA) and poly (butylene adipate-co-terephthalate) (PBAT) added with cinnamon essential oil (CEO) were prepared and characterized, and the hydrolytic degradation was assessed. A two-phase system was observed with spherical particles of PBAT embedded in the PLA matrix. The thermal analysis showed partial miscibility between PLA and PBAT. Mechanically, Young’s modulus decreased and the elongation at break increased with the incorporation of PBAT and CEO into the blends. The variation in weight loss for the fibers was below 5% during the period of hydrolytic degradation studied with the most important changes at 37 °C and pH 8.50. From microscopy, the formation of cracks in the fiber surface was evidenced, especially for PLA fibers in alkaline medium at 37 °C. This study shows the importance of the variables that influence the performance of polyester-cinnamon essential oil-based fibers in agro-industrial applications for horticultural product preservation.

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Section: Fourier Transform Infrared Spectroscopy-attenuated Total Refmentioning

confidence: 99%

Preparation and Characterization of Bio-Based PLA/PBAT and Cinnamon Essential Oil Polymer Fibers and Life-Cycle Assessment from Hydrolytic Degradation

et al. 2019

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“…It can be easily found that PLA presents a one‐step thermal degradation behavior during 250–400 °C range with little residue, and p‐SiO 2 exhibits a little mass loss (ca. 1.5%) in the testing temperature range . In contrast, f‐SiO 2 ‐10 exhibits a similar one‐stage thermal degradation to neat PLA with a mass losses 23.4%.…”

Section: Resultsmentioning

confidence: 89%

Simultaneously reinforcing and toughening poly(lactic acid) by incorporating reactive melt‐functionalized silica nanoparticles

Wang

Zhang

et al. 2019

J of Applied Polymer Sci

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Simultaneously reinforcing and toughening poly(lactic acid) (PLA) was carried out by adding a small amount of functionalized SiO2 (f‐SiO2) with grafting degraded PLA chains in this work. Typically, the high shear force and high temperature condition of melt blending were employed to accelerate the degradation of PLA and graft the degraded PLA chains onto SiO2.The structure characterizations revealed that large quantity of degraded PLA chains were grafted onto the surface of SiO2 by transesterification, condensation, and esterification reactions during melt blending. Due to the improvement in dispersion and interfacial interaction in PLA matrix, the f‐SiO2 exhibited an effective reinforcing and toughening effect for PLA, where the tensile strength, elongation at break, and impact toughness of PLA/f‐SiO2 nanocomposite increased by 14.9, 47.8, and 30.3% compared to neat PLA. Besides, the degree of crystallinity of PLA was significantly improved by the added f‐SiO2, which also contributed to improving mechanical properties. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48834.

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“…Furthermore, aliphatic polyesters are often (bio)degradablem aterials in which the ester linkage can be easily cleaved by hydrolysis through alkaline, acid, or enzymatic catalysis. [21,22] Moreover,p olyesters can also be degraded by thermal activation, [23,24] oxidation, [25] photolysis, [26] or radiolysis, [27] for which degradation takes place through the scissiono ft he main and/ or side chains of the polymer due to the formation of radicals. Biodegradation takes place throught he action of enzymes( biotic phenomena) associated with livingo rganismsa nd/or chemical deterioration (abiotic phenomena, such as oxidation, thermal degradation, photodegradation).…”

Section: Synthesis Of Polyestersmentioning

confidence: 99%

“…This is followed by the bioassimilation of thesep olymer fragments by microorganisms and their mineralization to produce mainly CO 2 or CH 4 (aerobic or anaerobic environment, respectively), water,a nd an ew generation of biomass.H owever,s emiaromatic polyesters do not exhibit the same ability for biodegradation as that of aliphatic ones; this is likely to be due to steric hindrance of aromatic moieties inside the enzyme catalytic site, [19,20] although progress has been made in the last few years to improvet heir biological degradability. [21,22] Moreover,p olyesters can also be degraded by thermal activation, [23,24] oxidation, [25] photolysis, [26] or radiolysis, [27] for which degradation takes place through the scissiono ft he main and/ or side chains of the polymer due to the formation of radicals. Therefore, aliphatic and semiaromatic polyesters presenta great number of end-of-life scenarios because theyc an be disposed of, recycled, [28] composted, or incinerated with low environmentalimpacts.…”

Section: Synthesis Of Polyestersmentioning

confidence: 99%

Biotic and Abiotic Synthesis of Renewable Aliphatic Polyesters from Short Building Blocks Obtained from Biotechnology

2018

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Biobased polymers have seen their attractiveness increase in recent decades thanks to the significant development of biorefineries to allow access to a wide variety of biobased building blocks. Polyesters are one of the best examples of the development of biobased polymers because most of them now have their monomers produced from renewable resources and are biodegradable. Currently, these polyesters are mainly produced by using traditional chemical catalysts and harsh conditions, but recently greener pathways with nontoxic enzymes as biocatalysts and mild conditions have shown great potential. Bacterial polyesters, such as poly(hydroxyalkanoate)s (PHA), are the best example of the biotic production of high molar mass polymers. PHAs display a wide variety of macromolecular architectures, which allow a large range of applications. The present contribution aims to provide an overview of recent progress in studies on biobased polyesters, especially those made from short building blocks, synthesized through step-growth polymerization. In addition, some important technical aspects of their syntheses through biotic or abiotic pathways have been detailed.

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Thermal, thermo-oxidative and thermomechanical degradation of PLA: A comparative study based on rheological, chemical and thermal properties

Cited by 99 publications

References 38 publications

Preparation and Characterization of Bio-Based PLA/PBAT and Cinnamon Essential Oil Polymer Fibers and Life-Cycle Assessment from Hydrolytic Degradation

Preparation and Characterization of Bio-Based PLA/PBAT and Cinnamon Essential Oil Polymer Fibers and Life-Cycle Assessment from Hydrolytic Degradation

Simultaneously reinforcing and toughening poly(lactic acid) by incorporating reactive melt‐functionalized silica nanoparticles

Biotic and Abiotic Synthesis of Renewable Aliphatic Polyesters from Short Building Blocks Obtained from Biotechnology

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