Water vapor solubility of poly(lactic acid) films modified the surface by vacuum ultraviolet irradiation

Saiga, T.; Sato, Shuichi; Nagai, Kazukiyo

doi:10.1002/app.42200

Cited by 10 publications

(19 citation statements)

References 20 publications

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“…The decrease in molecular weight that was induced by the light irradiation shortened the hydrolysis period required to attain the critical value, resulting in a faster mass decrease. In addition, the dissociation of bonds results in the acceleration of hydrolysis since the degradation products, including hydrophilic carboxylic acid, increase the degree of water absorption28. The diameter of the laser ablation crater that was formed with a laser wavelength of 400 nm expanded more rapidly than that with 800 nm (Fig.…”

Section: Discussionmentioning

confidence: 99%

Biodegradability of poly(lactic-co-glycolic acid) after femtosecond laser irradiation

Shibata

Yada

Terakawa

2016

Sci Rep

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Biodegradation is a key property for biodegradable polymer-based tissue scaffolds because it can provide suitable space for cell growth as well as tailored sustainability depending on their role. Ultrashort pulsed lasers have been widely used for the precise processing of optically transparent materials, including biodegradable polymers. Here, we demonstrated the change in the biodegradation of a poly(lactic-co-glycolic acid) (PLGA) following irradiation with femtosecond laser pulses at different wavelengths. Microscopic observation as well as water absorption and mass change measurement revealed that the biodegradation of the PLGA varied significantly depending on the laser wavelength. There was a significant acceleration of the degradation rate upon 400 nm-laser irradiation, whereas 800 nm-laser irradiation did not induce a comparable degree of change. The X-ray photoelectron spectroscopy analysis indicated that laser pulses at the shorter wavelength dissociated the chemical bonds effectively, resulting in a higher degradation rate at an early stage of degradation.

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Section: Discussionmentioning

confidence: 99%

Biodegradability of poly(lactic-co-glycolic acid) after femtosecond laser irradiation

Shibata

Yada

Terakawa

2016

Sci Rep

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“…However, the gas barrier property of PLA is inferior to that of PET. Additionally, swelling and plasticization of PLA can occur because of the contents dissolution of PLA, resulting in the reduction of the gas barrier capacity of PLA . Consequently, we exploited the high degree of crystallinity in PLA to enhance their gas barrier properties and to suppress swelling and plasticization.…”

Section: Introductionmentioning

confidence: 99%

Effect of glucose fouling on the dissolved gases permeation through maximum‐crystallized poly(lactic acid) films

Hsiao

Nara

Kitagawa

et al. 2018

J of Applied Polymer Sci

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In this study, we investigated the effect of fouling on the dissolved oxygen and carbon dioxide permeation in water through maximum-crystallized poly(lactic acid) (PLA) films by using proton nuclear magnetic resonance, attenuated total reflection-Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, and ultraviolet-visible spectroscopy, contact angle, water content ratio, and dissolved gas permeation. Fouling means the adhesion of contents on a container's internal surface, where content adhesion can directly influence the barrier property of the container. Glucose, a beverage ingredient, was used as a foulant. The permeation of dissolved gases in amorphous PLA film, maximum-crystallized PLA film, and fouled maximum-crystallized PLA film was determined. The decreased interstices in the polymer chains during crystallization resulted in the inhibition of the diffusion and decrease in the permeability coefficient of the gases. Moreover, the slope of the permeability coefficient for carbon dioxide in the Arrhenius plot was found smaller than that of oxygen's. This result indicated that the gas barrier property of dissolved carbon dioxide was considerably influenced by solubility and readily decreases during glucose fouling. V C 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46604.

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“…Therefore, the incorporation of carboxyl groups onto the nanofibrous PLA matrix is necessary to facilitate the deposition on the substrate. Surface modification via VUV irradiation is known to be a suitable technology for adhesion of materials and surface cleaning [14,15]. This method has been applied to a wide variety of materials, including polymers, glasses, ceramics, and metals [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Surface modification via VUV irradiation is known to be a suitable technology for adhesion of materials and surface cleaning [14,15]. This method has been applied to a wide variety of materials, including polymers, glasses, ceramics, and metals [14,15]. The surface modification of the nanofibrous PLA matrix occurs by photodegradation and photo oxidation reactions through the Norrish type Ⅱ mechanism [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…This method has been applied to a wide variety of materials, including polymers, glasses, ceramics, and metals [14,15]. The surface modification of the nanofibrous PLA matrix occurs by photodegradation and photo oxidation reactions through the Norrish type Ⅱ mechanism [14,15]. As the photon at 172 nm wavelength is adsorbed in the PLA, it induces a cleavage reaction of the PLA chain and a carboxyl group is generated at newly formed chain terminal.…”

Section: Introductionmentioning

confidence: 99%

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Surface Modification of PLA Nanofibers for Coating with Calcium Phosphate

Suzuki

Nagata

Inagaki

et al. 2018

Trans. Mat. Res. Soc. Japan

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In recent years, three-dimensional scaffolds have attracted great attention due to the development of stem cell tissue engineering. It is expected that the combination of three-dimensional scaffolds and stem cells will be a promising therapy for large defects of tissue such as bone. We have been developing three-dimensional scaffolds by coating poly-lactic acid (PLA) nanofibers with hydroxyapatite (HAp; Ca10(PO4)6(OH)2). Although PLA, a biodegradable polymer, is used in many biomaterials and HAp has great biocompatibility, PLA nanofibers are difficult to coat with HAp due to its hydrophobic property. Calcium phosphate deposition requires hydrophilic groups such as carboxyl groups, which play a key role as calcium phosphate nucleation sites. Hence, in this work, the surface of PLA nanofibers was modified by vacuum ultraviolet (VUV) irradiation or by co-electrospinning with gelatin as a hydrophilic polymer to increase the number of calcium phosphate nucleation sites. The deposition behavior of calcium phosphate on the VUV irradiated PLA nanofibers was facilitated in comparison with the pristine nanofibrous PLA matrices. Therefore, the surface modification via VUV irradiation was an effective way to produce nucleation sites for calcium phosphate deposition.

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Water vapor solubility of poly(lactic acid) films modified the surface by vacuum ultraviolet irradiation

Cited by 10 publications

References 20 publications

Biodegradability of poly(lactic-co-glycolic acid) after femtosecond laser irradiation

Biodegradability of poly(lactic-co-glycolic acid) after femtosecond laser irradiation

Effect of glucose fouling on the dissolved gases permeation through maximum‐crystallized poly(lactic acid) films

Surface Modification of PLA Nanofibers for Coating with Calcium Phosphate

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