Degradation of Polylactide—Polyethylene Binary Blends in Soil

Подзорова, М. В.; Tertyshnaya, Yu. V.

doi:10.1134/s1070427219060065

Cited by 16 publications

(8 citation statements)

References 16 publications

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“…The formation of such pits and holes on the surface of polyesterurethanes, after the action of particular strains of microorganisms, has often been observed [ 38 ]. As Podzorova and Tertyshnaya point out, despite a smaller reduction in the mass of the PLA/PE blend after exposure to soil in the field than in the laboratory, the changes in the surface of the samples from the field were greater [ 39 ]. This was related to the activity of microorganisms, the amount of which in laboratory conditions gradually decreased because they were not replenished.…”

Section: Resultsmentioning

confidence: 99%

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Susceptibility to Degradation in Soil of Branched Polyesterurethane Blends with Polylactide and Starch

Brzeska

Jasik²,

Sikorska

et al. 2022

Polymers

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A very important method of reducing the amount of polymer waste in the environment is the introduction to the market of polymers susceptible to degradation under the influence of environmental factors. This paper presents the results of testing the susceptibility to degradation in soil of branched polyesterurethane (PUR) based on poly([R,S]-3-hydroxybutyrate) (R,S-PHB), modified with poly([D,L]-lactide) (PLA) and starch (St). Weight losses of samples and changes in surface morphology (SEM, OM and contact angle system) with simultaneously only slight changes in molecular weight (GPC), chemical structure (FTIR and 1HNMR) and thermal properties (DSC) indicate that these materials are subject to enzymatic degradation caused by the presence of microorganisms in the soil. Chemical modification of branched polyesterourethanes with R,S-PHB and their physical blending with small amounts of PLA and St resulted in a slow but progressive degradation of the samples.

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Section: Resultsmentioning

confidence: 99%

“…Both modifiers are biodegradable, despite PLA being a hydrophobic material [ 39 ]. In contrast, starch is a highly hydrophilic material, like guar gum, that draws moisture into the blend, allowing the growth of starch-processing microorganisms.…”

Section: Resultsmentioning

confidence: 99%

Susceptibility to Degradation in Soil of Branched Polyesterurethane Blends with Polylactide and Starch

Brzeska

Jasik²,

Sikorska

et al. 2022

Polymers

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show abstract

“…The magnitude of the degree of crystallinity χ cr was calculated by the formula (1) where the heat of fusion of an ideal PLA crystal = 93.1 J/g [20], and for polyethylene = 293 J/g [21].…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Effect of Ozone on the Structure and Dynamics of Polylactide-Polyethylene Blends

Tertyshnaya

Карпова

Подзорова

2021

Russ. J. Phys. Chem. B

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In this study the effect of ozone on the structural and dynamic characteristics of polymeric mixtures of polylactide-low density polyethylene (LDPE) of various compositions is investigated. It is shown by the method of electron paramagnetic resonance that the segmental mobility in the amorphous phase is higher in mixtures with a predominance of polyethylene. After ozone exposure at T = (20 ± 2)°C for 16 h, the correlation time of the probe rotation decreases for all samples. It is determined by differential scanning calorimetry that the melting point of polylactide decreases by 2-4°С, and the glass transition temperature, by 1-3°C; and at the same time, the degree of crystallinity increases by 3-6%. The thermophysical characteristics of LDPE are observed to decline.

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“…The effect of ultraviolet on the mechanical properties of PLA/LDPE film samples has been studied. It is shown that changes in thermophysical characteristics are observed both in the polylactide phase and in the polyethylene phase [7,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of UV-Irradiation and Ozone Exposure on Thermal and Mechanical Properties of PLA/LDPE Films

Подзорова

2022

Materials Research Proceedings

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Abstract. The mechanical properties of polymer composites based on polylactide vary significantly over a wide range of values. It has been established that photodegradation of low-density polyethylene – polylactide blends occurs both in the amorphous and in the crystalline phase of the PLA matrix, which leads to deterioration of the mechanical properties of the studied mixtures. Ozonolysis affects the strength parameters of polylactide-polyethylene samples as well as photodegradation. By the differential scanning calorimetry it is determined that the melting point of polylactide decreases by 2-4 °C, the glass transition temperature - by 1-3 °C, while the degree of crystallinity increases by 3-6%. In the process of ozonolysis, the thermophysical characteristics of PLA/LDPE have changed.

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Degradation of Polylactide—Polyethylene Binary Blends in Soil

Cited by 16 publications

References 16 publications

Susceptibility to Degradation in Soil of Branched Polyesterurethane Blends with Polylactide and Starch

Susceptibility to Degradation in Soil of Branched Polyesterurethane Blends with Polylactide and Starch

Effect of Ozone on the Structure and Dynamics of Polylactide-Polyethylene Blends

Effect of UV-Irradiation and Ozone Exposure on Thermal and Mechanical Properties of PLA/LDPE Films

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