Photodegradation of polylactic acid: Characterisation of glassy and melt behaviour as a function of molecular weight

Virág, Ábris Dávid; Tóth, Csenge; Molnár, Kolos

doi:10.1016/j.ijbiomac.2023.126336

Cited by 5 publications

(3 citation statements)

References 54 publications

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“…This decline of T g is consistent with the trend of molecular weight, which can be attributed to the chain scission and the enhanced molecular mobility occurring during the degradation. ,, Moreover, T g is further plotted as a function of 1/ M n under different aging conditions, as shown in Figure c. A linear correlation can be found between T g and 1/ M n , as described by the Fox–Flory relationship T g = T normalg , ∞ − k M normaln , , where T g,∞ is the glass transition temperature of PLA with infinite molecular weight and k is the Fox–Flory constant. Based on this relationship, a value of 70.2 °C can be obtained for T g,∞ .…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

How Shall We Accelerate the Weathering of Durable PLA-Based Products: Inspiration from Different Industrial Standards

Wang,

Li,

Kong

et al. 2023

ACS Sustainable Chem. Eng.

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Section: Resultsmentioning

confidence: 99%

“…, 14,52 where T g,∞ is the glass transition temperature of PLA with infinite molecular weight and k is the Fox−Flory constant. Based on this relationship, a value of 70.2 °C can be obtained for T g,∞ .…”

Section: Structural and Morphological Evolutionmentioning

confidence: 99%

How Shall We Accelerate the Weathering of Durable PLA-Based Products: Inspiration from Different Industrial Standards

Wang,

Li,

Kong

et al. 2023

ACS Sustainable Chem. Eng.

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“…A significant number of works are presented in the literature that have explored the impact of UV radiation on kinetics and the mechanism of PLA photodegradation, where the polyester occurs as a homopolymer, blends, and composites [17][18][19][20][21][22]. These works were devoted to the study of molecular mass evolution, analytical assessment of the chemical composition comprising the intermediate and final products of photodegradation, the analysis of changes in the morphology and crystallinity, and tests of mechanical behavior.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Modeling of Polylactide Photodegradation under Ultraviolet Irradiation: Bio-Based Polyester Photolysis Mechanism

Lomakin,

Mikheev,

Usachev

et al. 2024

Polymers

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In our study, we investigated the accelerated aging process of PLA under 253.7 nm UV-C irradiation with the use of the GPC, NMR, FTIR, and DSC methods and formal kinetic analysis. The results of GPC and DSC indicated a significant degree of destructive changes in the PLA macromolecules, while spectroscopic methods NMR and FTIR showed maintenance of the PLA main structural elements even after a long time of UV exposure. In addition to that, the GPC method displayed the formation of a high molecular weight fraction starting from 24 h of irradiation, and an increase in its content after 144 h of irradiation. It has been shown for the first time that a distinctive feature of prolonged UV exposure is the occurrence of intra- and intermolecular radical recombination reactions, leading to the formation of a high molecular weight fraction of PLA decomposition products. This causes the observed slowdown of the photolysis process. It was concluded that photolysis of PLA is a complex physicochemical process, the mechanism of which depends on morphological changes in the solid phase of the polymer under UV radiation.

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Effects of carbon‐based nanoparticles on the properties of poly(lactic acid) hybrid composites containing basalt fibers and carbon‐based nanoparticles processed by injection molding

Juhász,

Pinke,

Gonda

et al. 2024

Polymer Engineering & Sci

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In this study, we developed composites with a poly(lactic acid) matrix and reinforced with basalt fiber, carbon‐based nanoparticles (carbon nanotube [CNT] and expanded graphene [GNP]), and both basalt fiber and nanoparticles (hybrid composites). The composites were produced by extrusion, and then tensile specimens were injection molded from the composites. The hybrid composites exhibited enhanced mechanical properties. The reinforcing materials increased crystallinity; this was more pronounced for hybrid composites. We experienced significant increase in the glass transition temperature, which proves the better interaction between the reinforcing and the matrix phases. Dynamic mechanical thermal analysis showed that the nanoparticles increased the storage modulus both alone and in combination with basalt fibers. Furthermore, the basalt fiber‐reinforced composites and hybrids exhibited significant modulus above the glass transition temperature. Based on scanning electron microscopy images of the fracture surfaces, we concluded that adding basalt fibers during compounding resulted in better dispersion of the nanoparticles.Highlights Poly(lactic acid) (PLA) reinforced with basalt fiber has good strength properties. Graphene hybrid exhibits notable tensile modulus improvement in hybrids. Graphene and carbon nanotubes are crystalline nucleating agents for PLA. Enhanced nanoparticle distribution was discovered for hybrid composites. The glass transition temperature of PLA increases with reinforcement.

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Photodegradation of polylactic acid: Characterisation of glassy and melt behaviour as a function of molecular weight

Cited by 5 publications

References 54 publications

How Shall We Accelerate the Weathering of Durable PLA-Based Products: Inspiration from Different Industrial Standards

How Shall We Accelerate the Weathering of Durable PLA-Based Products: Inspiration from Different Industrial Standards

Evaluation and Modeling of Polylactide Photodegradation under Ultraviolet Irradiation: Bio-Based Polyester Photolysis Mechanism

Effects of carbon‐based nanoparticles on the properties of poly(lactic acid) hybrid composites containing basalt fibers and carbon‐based nanoparticles processed by injection molding

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