Effect of UV Irradiation on the Structural and Dynamic Characteristics of Polylactide and Its Blends with Polyethylene

Tertyshnaya, Yu. V.; Подзорова, М. В.

doi:10.1134/s1990793120010170

Cited by 25 publications

(12 citation statements)

References 27 publications

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“…UV radiation is another aggressive environmental factor. During photo-destructive processes, polymers and the products that are made from them change various properties and colors and lose their performance characteristics [ 32 , 33 ]. When studying the effect of UV radiation on polymer materials, irradiators with different wavelengths are used.…”

Section: Resultsmentioning

confidence: 99%

Impact of Water and UV Irradiation on Nonwoven Polylactide/Natural Rubber Fiber

2021

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A nonwoven fiber made of polylactide/natural rubber with a rubber content from 0 to 15 wt.% was obtained by electrospinning from a solution. The water sorption test showed that the addition of natural rubber into the polylactide matrix did not significantly affect the degree of water absorption of the fibers, which was in the range of 48.9–50.6%. The melt flow rate only increased by 0.5 g/10 min at a content of 15 wt.% natural rubber. The thermal characteristics after 120 days of degradation in distilled water and UV irradiation (50 h) at a wavelength of 365 nm were determined using differential scanning calorimetry. Changes in the values of the phase transition temperatures and the degree of crystallinity were determined. It was determined that the fiber samples from all compositions retained the propensity for photo- and hydrolytic degradation.

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Section: Resultsmentioning

confidence: 99%

Impact of Water and UV Irradiation on Nonwoven Polylactide/Natural Rubber Fiber

2021

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“…However, the tensile strength increases with the printing temperature, but the annealing process has a negative impact on the mechanical properties of the samples. Tertyshnaya [22] studied the effect of 3D printing technology on the physical properties of composite materials mixed with PLA and low-density polyethylene (LDPE) in FDM materials. They observed that the melting temperature changed by 1-2 • C, and with the glass transition temperature of 70-80 wt%, LDPE increased by 4-5 • C. After irradiating with UV light, LDPE showed brittle failure with the increase in irradiation time.…”

Section: Introductionmentioning

confidence: 99%

Effects of Printing Temperature and Filling Percentage on the Mechanical Behavior of Fused Deposition Molding Technology Components for 3D Printing

et al. 2021

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Additive manufacturing (AM) has the advantages of providing materials with lightweight microporous structures and customized features, and being environmentally safe. It is widely used in medical sciences, the aerospace industry, biological research, engineering applications, and other fields. Among the many additive manufacturing methods, fused deposition modeling (FDM) is relatively low-cost, wastes less raw material and has a lower technical threshold. This paper presents a study on 3D printing based on FDM by changing two printing parameters, namely the printing temperature and filling percentage. The produced polylactic acid (PLA) material was analyzed through tensile and Shore D hardness tests and the differences in mechanical properties before and after the UV curing process were analyzed. The results show that increasing the filling percentage or increasing the printing temperature can effectively improve the tensile Young’s modulus, ultimate tensile strength, elongation, and Shore hardness of the material. The UV curing process could enhance the rigidity and hardness of the material significantly but reduced the strength and toughness of the material. These findings could benefit researchers studying FDM with the goal of achieving sustainable manufactured materials.

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“…It is important to note that the authors of this study observed the appearance of such a band (at 1654 cm -1 with a shift) under the action of UV radiation on a PLA-LDPE mixture (Fig. 5) [29]. Therefore, we can say that the mechanism of the formation of the C=C bond during the degradation of PLA, known as the Norrish II mechanism (Fig.…”

Section: Resultsmentioning

confidence: 51%

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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Effect of UV Irradiation on the Structural and Dynamic Characteristics of Polylactide and Its Blends with Polyethylene

Cited by 25 publications

References 27 publications

Impact of Water and UV Irradiation on Nonwoven Polylactide/Natural Rubber Fiber

Impact of Water and UV Irradiation on Nonwoven Polylactide/Natural Rubber Fiber

Effects of Printing Temperature and Filling Percentage on the Mechanical Behavior of Fused Deposition Molding Technology Components for 3D Printing

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

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