Measurement of interdiffusion in polymeric materials by applying Raman spectroscopy

Bruckmoser, Katharina; Resch, Katharina; Kisslinger, Thomas; Lucyshyn, Thomas

doi:10.1016/j.polymertesting.2015.07.004

Cited by 20 publications

(11 citation statements)

References 15 publications

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“…Raman spectra of the treated and nontreated surfaces ( HYD_1 with 10 min of contact time) can be found in Figure S2. By comparison with the Raman spectrum observed for the PC substrate, we clearly observed the formation of a top layer in which the chemical composition is a mixture of PC- and VP-based hydrogels . A further interesting feature of confocal Raman microspectroscopy is related to the possibility of obtaining depth profiles that show the variation in the chemical composition from the surface to the PC bulk.…”

Section: Resultsmentioning

confidence: 85%

“…By comparison with the Raman spectrum observed for the PC substrate, we clearly observed the formation of a top layer in which the chemical composition is a mixture of PC-and VPbased hydrogels. 23 A further interesting feature of confocal Raman microspectroscopy is related to the possibility of obtaining depth profiles that show the variation in the chemical composition from the surface to the PC bulk. For this analysis, the top of a wrinkle hill was used as reference and Raman spectra were recorded at different depths up to 30 μm.…”

Section: ■ Resultsmentioning

confidence: 99%

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Chemical and Topographical Modification of Polycarbonate Surfaces through Diffusion/Photocuring Processes of Hydrogel Precursors Based on Vinylpyrrolidone

et al. 2017

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Facile procedures capable of simultaneously conferring hydrophilicity and tailored topography to surfaces of hydrophobic supports, such as polycarbonate (PC), are very attractive but rare. In this work, we describe a simple methodology to wrinkle PC surfaces after a process of (a) contacting with a photopolymerizable vinylic solution, (b) UV curing of such solutions, and (c) detachment of the formed polymer network, upon swelling in ethanol. The influence of different parameters such as contact lag time between the PC surface and the polymerizable solution, the monomer concentration and type of solvents, as well as the cross-linking degree on the formation of wrinkles, has been studied. The dimensions of the wrinkles can be tailored to some extent by altering the different parameters. Surface chemistry has been analyzed by contact angle measurements and by confocal Raman microscopy. The results are consistent with a chemical alteration of the surface and the formation of an outer hydrogel layer, which is interpenetrated into the PC structure. A mechanism of monomer diffusion and PC swelling that produces surface instabilities and wrinkling is proposed.

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Section: Resultsmentioning

confidence: 85%

Section: ■ Resultsmentioning

confidence: 99%

Chemical and Topographical Modification of Polycarbonate Surfaces through Diffusion/Photocuring Processes of Hydrogel Precursors Based on Vinylpyrrolidone

et al. 2017

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“…Raman spectroscopy is a nondestructive technique that is widely used to characterize the structural and the electronic properties of carbon materials, including carbon nanotubes, diamond, graphite, and carbon fibers [24,25,26]. The carbon materials in the first order spectrum (1000–2000 cm −1 ) showed two primary characteristic bands (the G band at 1580 cm −1 and the D band at 1360 cm −1 ).…”

Section: Resultsmentioning

confidence: 99%

Effect of Load on the Thermal Expansion Behavior of T700 Carbon Fiber Bundles

Geng

et al. 2018

Polymers

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T700 carbon fiber bundles (CFBs) are the primary material used for manufacturing cable-net in a deployable antenna. In this paper, the relationships between the coefficient of thermal expansion (CTE) of T700 CFBs and the experimental load were investigated. The microstructure of T700 CFBs was analyzed with Raman spectra and XRD before and after the thermomechanical test. The measured results indicated that the T700 CFBs that were parallel to the axis had negative expansion characteristics when in a temperature range of −150-+150 • C. The thermal strain that occurred during the heating and the cooling thermal cycles had an unclosed curve that served as the loop. When the thermal cycles were the same, the position of the strain loop and the length of the sample exhibited regular change. The average of the CTEs decreased as the experimental load increased. The microstructural analysis suggested that the degree of structural order and the degree of orientation along the fiber axis improved with the experimental load increase. The change of microstructure parameters could be the primary cause of the negative CTE's variation within the T700 CFBs. The experimental results provide some guidelines for improving the cable-net material selection.

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“…The first, which appears at 237 cm -1 is attributed to C-H deformation; the second, at 543 cm -1 , the band is related to CH 2 balance and vibration; the third band, at 1086 cm -1 is due to C-C stretch and CH 3 balance 20 . These bands can be related to organic compounds preserved in acidic media, whose can adsorb onto the metallic surface, providing the inhibition of corrosive processes.…”

Section: Raman Spectroscopymentioning

confidence: 96%

Aqueous Agro-Industrial Waste as Corrosion Inhibitor for Stainless Steel AISI 304 in Acidic Media

et al. 2019

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The current studies aim to apply natural products as corrosion inhibitors, once the most used compounds are mostly toxic to the environment and to humans. The present paper purposes the application of an aqueous extract of agro-industrial waste (AEAW) to inhibit the corrosion of stainless steel AISI 304 in sulfuric acid. Gravimetric and electrochemical experiments were performed. The gravimetric experiments revealed that the extract acts as an inhibitor for stainless steel, showing inhibitory efficiency up to 81.6%. The electrochemical tests show that the AEAW makes the steel surface more noble. The extract acts by adsorption in the metallic surface, following a Temkin isotherm. The results indicate that the AEAW is a promising substitute of conventional organic compounds as a corrosion inhibitor to AISI 304 stainless steel in sulfuric acid.

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Measurement of interdiffusion in polymeric materials by applying Raman spectroscopy

Cited by 20 publications

References 15 publications

Chemical and Topographical Modification of Polycarbonate Surfaces through Diffusion/Photocuring Processes of Hydrogel Precursors Based on Vinylpyrrolidone

Chemical and Topographical Modification of Polycarbonate Surfaces through Diffusion/Photocuring Processes of Hydrogel Precursors Based on Vinylpyrrolidone

Effect of Load on the Thermal Expansion Behavior of T700 Carbon Fiber Bundles

Aqueous Agro-Industrial Waste as Corrosion Inhibitor for Stainless Steel AISI 304 in Acidic Media

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