Interaction of 157-nm excimer laser radiation with fluorocarbon polymers

George, Sharon R.; Leraas, John A.; Langford, S. C.; Dickinson, J. T.

doi:10.1016/j.apsusc.2009.04.090

Cited by 9 publications

(7 citation statements)

References 15 publications

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“…Simultaneously the F fraction in PVDF decreased gradually as the etching progressed and finally the process stopped. Similar behavior was reported for PVDF irradiated with ion beams [9,10] and excimer lasers [13][14][15].…”

Section: Introductionsupporting

confidence: 82%

“…Irradiation of PVDF with these sources resulted in strong modification of the molecular structure in a near surface layer of the polymer. The chemical changes are associated with dehydrogenation, defluorination [10,12,15,16] and crosslinking between the polymer chains [12,17]. The changes, especially the defluorination, strongly influence the ablation process.…”

Section: Introductionmentioning

confidence: 98%

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EUV induced ablation and surface modification of poly(vinylidene fluoride) irradiated in vacuum or gaseous environment

Bartnik¹,

Lisowski²,

Sobczak³

et al. 2013

SPIE Proceedings

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Extreme ultraviolet (EUV) is an ionizing radiation strongly absorbed in any kind of mater. In case of polymers absorption depth is of the order of 100 nm. Interaction of EUV photons with polymer chains results in chain scission and formation of low weight fractions. In this work interaction of intense EUV pulses with poly(vinylidene fluoride) (PVDF) was investigated. Mass spectroscopy was employed to investigate the ablation products indicating emission of numerous molecular species of C-containing fragments of the polymer chain. Chemical surface changes after irradiation were investigated using X-ray photoelectron spectroscopy (XPS). The XPS spectra obtained for PVDF, samples irradiated with low and high EUV fluence, indicate significant differences between chemical structures in near-surface layers. It was shown that irradiation with low fluence results in defluorination and thus carbon enrichment in nearsurface layer. In contrary, irradiation with high fluence leads to intense material ablation and hardly modifies the chemical structure of the remaining material. Additionally chemical modification of the PVDF surface by EUV irradiation in a presence of ionized nitrogen was investigated. The nitrogen gas, injected into an interaction region, was ionized and excited by the EUV radiation from a laser-plasma source. An ionization degree and excited states of nitrogen were investigated using an EUV spectrometry and the corresponding spectra are presented. Chemical modification of the polymer after combined EUV and ionized nitrogen treatment was investigated using an X-ray photoelectron spectroscopy. Significant contribution of the nitrogen atoms in the polymer near-surface layer after the treatment was demonstrated.

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Section: Introductionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 98%

EUV induced ablation and surface modification of poly(vinylidene fluoride) irradiated in vacuum or gaseous environment

Bartnik¹,

Lisowski²,

Sobczak³

et al. 2013

SPIE Proceedings

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“…Los láseres de Nd:YAG y CO 2 son los sistemas más recomendados para la extracción de fluoropolímeros (Riva y Pezzetti, 1997;Ol´khov et al, 2010). También se conocen sistemas de eliminación de películas delgadas de PTFE con láseres de excímero (F 2 ) con una longitud de onda de 157 nm (George et al, 2009;Reznicêkova et al, 2011). El proceso es conocido como ablación láser y puede ser efectuado mediante láseres pulsados o continuos.…”

Section: Sistemas De Eliminación De Los Recubrimientosunclassified

Ablación láser de recubrimientos de politetrafluoretileno (PTFE) aplicados sobre sustratos EN AW-5251

2014

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RESUMEN:En la actualidad se utilizan diversos sistemas de eliminación de recubrimientos ricos en politetrafluoretileno (PTFE) sobre sustratos metálicos: granallado, pirólisis, procedimientos químicos y combinaciones de ellos, presentando todos ellos serias dificultades. En el presente trabajo se propone el uso de ablación láser para eliminar recubrimientos ricos en PTFE que previamente han sido aplicados en chapas de la aleación de aluminio magnesio EN AW-5251 H34. Para ello se han analizado los valores del límite elástico convencional, resistencia a la tracción, alargamiento porcentual, energía retenida por impacto y dureza. También se ha evaluado la distribución del tamaño de grano a nivel microestructural, el tamaño medio de grano ASTM y la distribución de partículas constituyentes. Los estudios se han efectuado en tres etapas sucesivas de aplicación y eliminación láser del recubrimiento. De forma paralela, se determinan y se comparan las propiedades con los mismos sustratos y etapas, pero eliminados por pirólisis. De la comparación de los resultados se concluye que la eliminación por ablación láser no produce un empobrecimiento añadido de las propiedades de los sustratos y que puede convertirse en una alternativa industrial a los procedimientos de eliminación tradicionales. ABSTRACT: Laser ablation of polytetrafluoroethylene (PTFE) coatings applied on EN AW-5251 substrates.Currently the most common used methods for removing PTFE rich coatings on metal substrates are: grinding, pyrolysis, chemical processes or a combination of these. While effective, all present serious difficulties. In this paper the use of laser ablation to remove PTFE rich coatings, which have previously been applied to sheets of aluminum magnesium alloy EN AW-5251 H34, is proposed. For this purpose the values of the yield strength, tensile strength, percent elongation, impact energy retained and hardness are analyzed. Equally, the grain size distribution at the microstructural level, the ASTM average grain size and distribution of constituent particles have been evaluated. Measurements were performed to three successive stages of application and laser coating removal. Moreover, the previous set of properties have been determined for the same substrates and stages but using pyrolysis to remove the coating. Comparison of the results shows that the removal by laser ablation does not cause any reduction in the properties of the substrates and may become an industrial alternative to traditional disposal procedures.

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“…For example, latest preferences in the aeronautic field, extends to the use of robotized equipment's with laser sources emitting in the infrared spectrum and powers up to 6 kW [28]. According to some authors, Nd:YAG and CO 2 are the more recommended sources for the removal of fluoropolymers [29,30], although other laser sources, as excimer lasers, has been used for PTFE thin films removal [31,32].…”

Section: Coating Removal Methodsmentioning

confidence: 99%

Laser and pyrolysis removal of fluorinated ethylene propylene thin layers applied on EN AW-5251 aluminium substrates

Guerrero‐Vaca

Sevilla

Soriano

2015

Applied Surface Science

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Interaction of 157-nm excimer laser radiation with fluorocarbon polymers

Cited by 9 publications

References 15 publications

EUV induced ablation and surface modification of poly(vinylidene fluoride) irradiated in vacuum or gaseous environment

EUV induced ablation and surface modification of poly(vinylidene fluoride) irradiated in vacuum or gaseous environment

Ablación láser de recubrimientos de politetrafluoretileno (PTFE) aplicados sobre sustratos EN AW-5251

Laser and pyrolysis removal of fluorinated ethylene propylene thin layers applied on EN AW-5251 aluminium substrates

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