Evaluation of degradation of ultraviolet-C irradiated polylactic acid/carbon-fiber composites using fluorescence spectroscopy

Pinpathomrat, Badin; Narita, Chieko; Yokoyama, Akira; Yamada, Kazutoyo

doi:10.1080/09243046.2021.1943108

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…2 shows the FT-IR spectra of a typical PLA film and nanoporous PLA fiber normalized at 1084 cm −1 . As can be seen from the figure, the characteristic absorption bands of PLA (C=O stretching vibration at 1747 cm −1 , in-plane deformation at 1454 cm −1 , and rocking vibration at 1182 cm −1 ) are indicated by the presence of 1269 and 1211−1133 cm −1 bands, which are crystal bands in the PLA structure are known to be crystal bands in the PLA structure [1][2][3]6]. They consist of vibrational components, namely C−COO stretching, O−CH stretching, CH3 oscillations, and CH bending.…”

Section: Resultsmentioning

confidence: 97%

“…Among them, plant-derived polylactic acid (PLA) is one of the most widely used biopolymers and is expected to replace petroleum-based plastics. Most biopolymers have low melting points and heat resistance temperatures, and their high crystallinity makes them hard and brittle, making it difficult to use them as a single material in injection molded products [1,2]. However, fibers and films are highly stretched, which may inhibit crystallization to some extent.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Nanoporous Poly(Lactic Acid) Microfibers Using a Simplified Centrifugal Spinning Method

Yamada,

Narita

2024

MSF

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In recent years, great attention has been paid to the development of porous materials with excellent reactivity and absorbency. The poly(lactic acid) (PLA) microfibers with uniform nanopores were successfully prepared by rotary centrifugal spinning using PLA/chloroform solution. Previous research showed that PLA microfibers have extremely high oil absorbing capacity. In this study, the changes in fiber diameter and nanopore diameter of nanoporous PLA microfibers under different fabrication conditions and the adsorption capacity of Prussian blue nanoparticles were systematically evaluated. The results showed that the fiber diameter increased with increasing PLA/chloroform solution concentration. Furthermore, it was found that the amount of adsorbed Prussian blue nanoparticles increased with the increase in fiber diameter. Prussian blue nanoparticles are known to adsorb radioactive materials such as cesium, and are expected to be applied to the recovery of cesium diffused in the atmosphere and ocean.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Characterization of Nanoporous Poly(Lactic Acid) Microfibers Using a Simplified Centrifugal Spinning Method

Yamada,

Narita

2024

MSF

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“…Changes in the chemical structure of the polymer under radiation became apparent when comparing the FTIR spectra of the PLA samples (Figure 3). Table 1 shows the assignment of absorption bands in the FTIR spectra of the PLA samples [30,31]. The terminal hydroxyl groups of the initial polymer before irradiation showed a relatively small absorption peak at 3500 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Tailoring Photoprotection of Polylactide with New Isobornyl Derivatives of Phenol and Aniline

et al. 2023

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This article is devoted to the development of new photostabilizers for polylactide (PLA), a polymer that is an environmentally friendly alternative to polymers and is based on fossil raw materials. We have elucidated the role of the reaction center of two potential PLA photoprotectors: N-isobornylaniline and 2-isobornylphenol, in reactions occurring in a polymer matrix under the action of UV-C radiation. PLA samples with the photostabilizers were irradiated under a wavelength of 253.7 nm for 4, 8 and 12 hours. The effectiveness of the photostabilizers was evaluated based on FTIR spectrometric data, 1H and 13C NMR, scanning electron microscopy and simultaneous thermal analysis (TG-DSC). Both stabilizers led to the protection of ester bonds between monomer units of PLA. However, 2-isobornylphenol proved to be more effective at a concentration of 0.05 wt.%, while the optimal concentration of N-isobornylaniline was 0.5 wt.% by weight. TG-DSC showed that the addition of N-isobornylaniline led to an increase in PLA resistance to thermal decomposition; the temperature of the onset of weight loss increased by 2.8 °C at 0.05 wt.% and by 8.1 °C at 0.5 wt.% of N-isobornylaniline. The photoprotector 2-isobornylphenol, on the contrary, reduced the thermal stability of PLA.

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“…Ice filament black particles illustrated the lowest fluorescent intensity, with 9% of the particles sampled exhibiting fluorescence, whereas Sunlu black (25%), Eryone white (24%), and the control (24%) produced the highest fractions of fluorescent particles. The fluorescent characteristics of PLA-type material have been investigated previously in the literature, showing fluorescence in the 400–500 nm region following excitation in the 300–400 nm region [ 40 ] roughly coinciding with the WIBS excitation and emission channels.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Volatile and Particulate Emissions from Desktop 3D Printers

Finnegan,

Thach,

Khaki

et al. 2023

Sensors

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The rapid expansion of 3D printing technologies has led to increased utilization in various industries and has also become pervasive in the home environment. Although the benefits are well acknowledged, concerns have arisen regarding potential health and safety hazards associated with emissions of volatile organic compounds (VOCs) and particulates during the 3D printing process. The home environment is particularly hazardous given the lack of health and safety awareness of the typical home user. This study aims to assess the safety aspects of 3D printing of PLA and ABS filaments by investigating emissions of VOCs and particulates, characterizing their chemical and physical profiles, and evaluating potential health risks. Gas chromatography–mass spectrometry (GC–MS) was employed to profile VOC emissions, while a particle analyzer (WIBS) was used to quantify and characterize particulate emissions. Our research highlights that 3D printing processes release a wide range of VOCs, including straight and branched alkanes, benzenes, and aldehydes. Emission profiles depend on filament type but also, importantly, the brand of filament. The size, shape, and fluorescent characteristics of particle emissions were characterized for PLA-based printing emissions and found to vary depending on the filament employed. This is the first 3D printing study employing WIBS for particulate characterization, and distinct sizes and shape profiles that differ from other ambient WIBS studies were observed. The findings emphasize the importance of implementing safety measures in all 3D printing environments, including the home, such as improved ventilation, thermoplastic material, and brand selection. Additionally, our research highlights the need for further regulatory guidelines to ensure the safe use of 3D printing technologies, particularly in the home setting.

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Evaluation of degradation of ultraviolet-C irradiated polylactic acid/carbon-fiber composites using fluorescence spectroscopy

Cited by 8 publications

References 21 publications

Characterization of Nanoporous Poly(Lactic Acid) Microfibers Using a Simplified Centrifugal Spinning Method

Characterization of Nanoporous Poly(Lactic Acid) Microfibers Using a Simplified Centrifugal Spinning Method

Tailoring Photoprotection of Polylactide with New Isobornyl Derivatives of Phenol and Aniline

Characterization of Volatile and Particulate Emissions from Desktop 3D Printers

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