Fingerprint analysis of FTIR spectra of polymers containing vinyl acetate

Ramírez-Hernández, Aurelio; Aguilar-Flores, Celia; Aparicio‐Saguilán, Alejandro

doi:10.15446/dyna.v86n209.77513

Cited by 62 publications

(21 citation statements)

References 10 publications

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“…Hence, high water absorption could be expected for these samples. In line with this view, the bands at 3304 and 1639 cm À1 , corresponding to the O─H stretching and O─H bending of H 2 O, [43][44][45][46] were particularly observed for EVA33 and EVA33/SiO 2 (Figure 5(c), (d)). On the other hand, none of these bands can be noticed for EVA18 and EVA28 (Figure 5(a),(b)).…”

Section: Physicochemical Properties Of the Membranesupporting

confidence: 68%

AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification

Watasit

Rukchonlatee

Ausavasukhi

et al. 2021

J of Applied Polymer Sci

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The CO 2 and CH 4 permeabilities of poly(ethylene-co-vinyl acetate) (EVA)/ SiO 2 composite membrane were investigated at atmospheric pressure. The membranes were fabricated by compression molding and characterized by Fourier transformed infrared spectroscopy, differential scanning calorimetry, a universal testing machine, and a contact angle analyzer. The effect of vinyl acetate content (18-33 wt%) was evaluated for both single-gas and mixed-gas permeation systems. A non-pressurized homemade-permeation cell was used for the single-gas permeation of CO 2 and CH 4 , while a tubular membrane was utilized for a continuous separation of CO 2 /CH 4 mixture. CO 2 flux was readily increased (from 0.7 to 2.0 ml/m 2 .s) with vinyl acetate content (18-33 wt%). The enhanced CO 2 permeability is attributed to the increase in polarity and also the decrease in crystallinity of the membrane. A satisfied gas separation selectivity (CO 2 /CH 4 ) of 4.31 could be obtained from tubular membrane with 28 wt% VA content. The incorporation of SiO 2 as a filler (0.5-2.0 wt%) especially increased the membrane polarity and hence the CO 2 flux up to 6.0 ml/m 2 .s. However, the CH 4 flux was not affected by VA and SiO 2 contents.

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Section: Physicochemical Properties Of the Membranesupporting

confidence: 68%

AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification

Watasit

Rukchonlatee

Ausavasukhi

et al. 2021

J of Applied Polymer Sci

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“…The low-intensity mode located at 552 cm −1 can be attributed to Ag-O stretching, showing the presence of Ag in SiO 2 -Ag [ 96 , 97 ]. For EVA, bands referring to the fingerprint of the polymer are observed at 2954, 2850, 1467, 1243, 874, 707, and 546 cm −1 , related to the EVA aliphatic groups [ 98 , 99 , 100 , 101 , 102 ]. At 1020 cm −1 , the bending of the C–O–C bonds is observed [ 102 ], and at 1801 and 1739 cm −1 , the C=O bond stretching refers to two different types of carbonyl groups [ 101 , 102 ], as noted by Poljansek et al [ 103 ].…”

Section: Resultsmentioning

confidence: 99%

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

et al. 2021

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COVID-19, as the cause of a global pandemic, has resulted in lockdowns all over the world since early 2020. Both theoretical and experimental efforts are being made to find an effective treatment to suppress the virus, constituting the forefront of current global safety concerns and a significant burden on global economies. The development of innovative materials able to prevent the transmission, spread, and entry of COVID-19 pathogens into the human body is currently in the spotlight. The synthesis of these materials is, therefore, gaining momentum, as methods providing nontoxic and environmentally friendly procedures are in high demand. Here, a highly virucidal material constructed from SiO2-Ag composite immobilized in a polymeric matrix (ethyl vinyl acetate) is presented. The experimental results indicated that the as-fabricated samples exhibited high antibacterial activity towards Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) as well as towards SARS-CoV-2. Based on the present results and radical scavenger experiments, we propose a possible mechanism to explain the enhancement of the biocidal activity. In the presence of O2 and H2O, the plasmon-assisted surface mechanism is the major reaction channel generating reactive oxygen species (ROS). We believe that the present strategy based on the plasmonic effect would be a significant contribution to the design and preparation of efficient biocidal materials. This fundamental research is a precedent for the design and application of adequate technology to the next-generation of antiviral surfaces to combat SARS-CoV-2.

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“…The last spectral region “fingerprint” [ 44 ] below 900 cm −1 is responsible for crystal areas and indicates conformational changes in the material under research [ 45 ]. The region of the fingerprint is the region of infrared spectra where each organic compound has its own unique line of absorption.…”

Section: Resultsmentioning

confidence: 99%

Deep and Machine Learning Using SEM, FTIR, and Texture Analysis to Detect Polysaccharide in Raspberry Powders

Przybył

Koszela

Adamski

et al. 2021

Sensors

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In the paper, an attempt was made to use methods of artificial neural networks (ANN) and Fourier transform infrared spectroscopy (FTIR) to identify raspberry powders that are different from each other in terms of the amount and the type of polysaccharide. Spectra in the absorbance function (FTIR) were prepared as well as training sets, taking into account the structure of microparticles acquired from microscopic images with Scanning Electron Microscopy (SEM). In addition to the above, Multi-Layer Perceptron Networks (MLPNs) with a set of texture descriptors (machine learning) and Convolution Neural Network (CNN) with bitmap (deep learning) were devised, which is an innovative attitude to solving this issue. The aim of the paper was to create MLPN and CNN neural models, which are characterized by a high efficiency of classification. It translates into recognizing microparticles (obtaining their homogeneity) of raspberry powders on the basis of the texture of the image pixel.

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Fingerprint analysis of FTIR spectra of polymers containing vinyl acetate

Cited by 62 publications

References 10 publications

AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification

AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

Deep and Machine Learning Using SEM, FTIR, and Texture Analysis to Detect Polysaccharide in Raspberry Powders

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Fingerprint analysis of FTIR spectra of polymers containing vinyl acetate

Cited by 62 publications

References 10 publications

AtmosphericCO2/CH4permeability ofEVAcopolymer/SiO2composite membrane for biogas purification

AtmosphericCO2/CH4permeability ofEVAcopolymer/SiO2composite membrane for biogas purification

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

Deep and Machine Learning Using SEM, FTIR, and Texture Analysis to Detect Polysaccharide in Raspberry Powders

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Product

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AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification

AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification