Degradation of polylactide composites under UV irradiation at 254 nm

Olewnik-Kruszkowska, Ewa; Koter, Izabela; Skopińska-Wiśniewska, Joanna; Richert, J.

doi:10.1016/j.jphotochem.2015.06.029

Cited by 57 publications

(31 citation statements)

References 37 publications

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“…42 The 873 cm −1 peak was ascribed to the stretching vibration of terminal methylene group CH 2 . 43 The FTIR spectra of PW9S1 shows the same absorption peaks with PW filament, while the wavenumbers of PW8S2 shifted to higher values (3322 > 3293, 2940 > 2928, 1765 > 1749, 1465 > 1450, 1378 > 1364, 1209 > 1194, 1081 > 1071, 891 > 873). In the meantime, the intensity of the C O (1765 cm −1 ) and C O (1081 cm −1 ) stretching bands of PW8S2 increased sharply compared with the other two filaments.…”

Section: Methodsmentioning

confidence: 87%

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Thermal decomposition behavior of 3D printing filaments made of wood‐filled polylactic acid/starch blend

Sun

Lee

Wang

et al. 2020

J of Applied Polymer Sci

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Dynamic thermogravimetric analysis under nitrogen environment was used to understand the thermal decomposition process of 3D printing filaments made of wood-filled polylactic acid (PLA)/starch blend. The characteristic temperatures and apparent activation energy (AAE) of the filaments with various starch contents were calculated with well-known kinetic models by Friedman, Flynn-Wall-Ozawa, Coats-Redfern, and Kissinger. With the increased starch content in the filament, the onset thermal decomposition

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Section: Methodsmentioning

confidence: 87%

“…The peaks at 1194 and 1071 cm −1 attributed to stretching vibration of C  O bond 42 . The 873 cm −1 peak was ascribed to the stretching vibration of terminal methylene group CH 2  43 …”

Section: Resultsmentioning

confidence: 99%

Thermal decomposition behavior of 3D printing filaments made of wood‐filled polylactic acid/starch blend

Sun

Lee

Wang

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…In [ 40 ], the photodegradation of PLA-based nanocomposites with the addition of polycaprolactone and montmorillonite (wavelength 254 nm) was studied. As a result of research [ 38 ], it was found that the PLA was actively exposed to ultraviolet light.…”

Section: Discussionmentioning

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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“…As those changes may significantly decrease the quality of the produced goods, it is crucial to determine the influence of processing parameters on the properties of PLA and to evaluate the risk of degradation. Among the most distinct degradation mechanisms causing changes to the properties and quality of final PLA products (excluding hydrolytic degradation resulting from processing conditions as well as weathering and different environmental issues [21]) is thermo-oxidative degradation [22][23][24]. According to Cuadri et al [23], when a biodegradable polymer is subjected to shear stress and is additionally exposed to elevated temperature in an oxidative atmosphere, the degradation process is intensified, and can be measured with the relative modification index (RMI).…”

Section: Introductionmentioning

confidence: 99%

Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion

et al. 2020

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This article presents the effect of twin-screw extrusion processing parameters, including temperature and rotational speed of screws, on the structure and properties of four grades of polylactide (PLA). To evaluate the critical processing parameters for PLA and the possibilities for oxidative and thermomechanical degradation, Fourier-transform infrared spectroscopy (FT-IR), oscillatory rheological analysis, and differential scanning calorimetry (DSC) measurements were used. The influence of degradation induced by processing temperature and high shearing conditions on the quality of the biodegradable polyesters with different melt flow indexes (MFIs)was investigated by color analysis within the CIELab scale. The presented results indicate that considering the high-temperature processing of PLA, the high mass flow index and low viscosity of the polymer reduce its time of residence in the plastifying unit and therefore limit discoloration and reduction of molecular weight due to the degradation process during melt mixing, whereas the initial molecular weight of the polymer is not an essential factor.

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Degradation of polylactide composites under UV irradiation at 254 nm

Cited by 57 publications

References 37 publications

Thermal decomposition behavior of 3D printing filaments made of wood‐filled polylactic acid/starch blend

Thermal decomposition behavior of 3D printing filaments made of wood‐filled polylactic acid/starch blend

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

Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion

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