Enhanced thermal stabilization of polymer nanofibrous web using self-polymerized 3,4-dihydroxy-L-phenylalanine

Cheon, Ja Young; Park, Won Ho

doi:10.1016/j.polymer.2017.08.005

Cited by 14 publications

(12 citation statements)

References 16 publications

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“…Eumelanin, in the MFA form, did not show any antagonistic or synergistic effects with the butylated hydroxytoluene stabilizer, as it does not interfere with the thermal or thermo‐oxidative stabilization imparted by such a stabilizer. On the other hand, it has been reported that other polymers loaded with eumelanin presented higher degradation temperatures, suggesting thermal stabilization imparted by the biopigment . As this effect was associated in the literature with the radical scavenging properties of the biopigment, we make the hypothesis that the MFA treatment reduced the radical scavenging power of eumelanin.…”

Section: Resultsmentioning

confidence: 73%

“…On the other hand, it has been reported that other polymers loaded with eumelanin presented higher degradation temperatures, suggesting thermal stabilization imparted by the biopigment. 23,25,[30][31][32] As this effect was associated in the literature with the radical scavenging properties of the biopigment, 23,25,[30][31][32] we make the hypothesis that the MFA treatment reduced the radical scavenging power of eumelanin. This reduction following the MFA treatment has already been reported in the literature.…”

Section: Resultsmentioning

confidence: 99%

“…In such works, the polymer matrix embedding the pigment was protected by eumelanin against photodegradation under prolonged UV irradiation . Eumelanin was also assessed as a bio‐sourced thermal stabilizer for PI, PVA, polyhydroxybutyrate, poly(methyl methacrylate) and polypropylene, as it can scavenge the radicals that form during the thermal degradation of these polymers …”

Section: Introductionmentioning

confidence: 99%

“…In such works, the polymer matrix embedding the pigment was protected by eumelanin against photodegradation under prolonged UV irradiation. 28,29 Eumelanin was also assessed as a bio-sourced thermal stabilizer for PI, 25 PVA, 30,31 polyhydroxybutyrate, 32 poly(methyl methacrylate) 23 and polypropylene, 23 as it can scavenge the radicals that form during the thermal degradation of these polymers. 2,9 In the work reported here, we evaluated the biopigment eumelanin as an additive for the UV-absorption enhancement of a commercial grade of the ethylene-vinyl acetate (EVA) copolymer, used as plastic material for packaging applications ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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Eumelanin for nature‐inspired UV‐absorption enhancement of plastics

Mauro

Camaggi

Vandooren

et al. 2019

Polymer International

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In the human body, the black‐brown biopigment eumelanin blocks harmful ultraviolet (UV) radiation. In the plastics industry, additives are often added to polymers to increase their UV‐absorption properties. We herein report an assessment of the biopigment eumelanin as a nature‐inspired additive for plastics to enhance their UV absorption. Since eumelanin is produced by natural sources and is nontoxic, it is an interesting candidate in the field of sustainable plastic additives. In this work, the eumelanin‐containing films of commercial ethylene–vinyl acetate copolymer, a plastic used for packaging applications, were obtained by melt compounding and compression molding. The biopigment dispersion in the films was improved by means of the melanin free acid treatment. It was observed that eumelanin amounts as low as 0.8 wt% caused an increase of the UV absorption, up to one order of magnitude in the UVA range. We also evaluated the effect of eumelanin on the thermal stability and photostability of the films: the biopigment proved to be double‐edged, working both as UV‐absorption enhancer and photo‐prooxidant, as thermogravimetric analysis and infrared spectroscopy revealed. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Eumelanin for nature‐inspired UV‐absorption enhancement of plastics

Mauro

Camaggi

Vandooren

et al. 2019

Polymer International

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“…22 Several groups have reported the thermal degradation mechanisms of PLA, and no radicals were produced in the various pyrolysis reactions. 23,24 Research efforts have been focused on the enhancement of PLA thermal stability in order to allow it to be used under severe operation conditions. 25 In order to improve the thermal stability of polylactic acid, the most common method is to add nanoscale or micron-scale layered silicates (such as montmorillonite) in the polylactic acid matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Understanding thermal decomposition kinetics of flame-retardant thermoset polylactic acid

Qiang

Xie

et al. 2019

RSC Adv.

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The Flynn-Wall-Ozawa method was applied to study the local activation energy of flame retardant thermoset PLA, and the results showed that with an increase of conversion of thermal degradation, the local activation energy was increased slowly. When the conversion of thermal degradation was under 15%, the activation energy of flame retardant thermoset PLA was lower than that of thermoset PLA, attributed to the low bond energy of P-C bond. When the conversion of thermal degradation exceeded 15%, the dehydration charcoal effect of phosphorous compound slowed down the process of thermal degradation, and the activation energy of flame retardant thermoset PLA was higher than that of thermoset PLA, indicating that the addition of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) enhances the thermal stability of thermoset PLA. The Coats-Redfern method and invariant kinetic parameters method were used to understand kinetics details about this process including the activation energy and apparent pre-exponential factor, and estimated contribution ratios for the 18 kinetic functions. The results showed that the addition of DOPO didn't impact the most important mechanism of thermal degradation but changed the contribution ratios of the 18 kinetic functions.According to the functional relationship between decomposition rate with temperature and quality conversion rate, three-dimension surface plots were made to understand the change regulation of decomposition rate. We found that the addition of DOPO reduced the decomposition rate of thermoset PLA, attributing to the dehydration charcoal effect of phosphorous compound which restrained the interesterification of PLA, and thus enhancing the thermal stability of thermoset PLA.

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Mussel‐inspired synthesis of silver nanoparticles as fillers for preparing waterborne polyurethane/Ag nanocomposites with excellent mechanical and antibacterial properties

2021

Polymer International

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Silver nanoparticles (AgNPs) were synthesized by a facile, mild and green method using dopamine as a reducing and stabilizing agent and were introduced to waterborne polyurethane (WPU) via an in situ emulsification method to prepare antibacterial nanocomposite films. The formation of AgNPs was characterized by UV–visible spectroscopy and XRD. The dispersion of AgNPs was confirmed by TEM and the thermal stability of WPU/Ag nanocomposites was confirmed by TGA. The results showed that AgNPs were uniformly dispersed in the WPU matrix. The introduction of AgNPs significantly improved the thermal stability of WPU films. With incorporation of 0.1 wt% AgNPs, a five‐fold increase in the tensile strength was achieved without sacrificing the ultimate strain. The WPU/Ag nanocomposite films showed antibacterial activity against Escherichia coli and Staphylococcus aureus. © 2021 Society of Industrial Chemistry.

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Enhanced thermal stabilization of polymer nanofibrous web using self-polymerized 3,4-dihydroxy-L-phenylalanine

Cited by 14 publications

References 16 publications

Eumelanin for nature‐inspired UV‐absorption enhancement of plastics

Eumelanin for nature‐inspired UV‐absorption enhancement of plastics

Understanding thermal decomposition kinetics of flame-retardant thermoset polylactic acid

Mussel‐inspired synthesis of silver nanoparticles as fillers for preparing waterborne polyurethane/Ag nanocomposites with excellent mechanical and antibacterial properties

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