The Experts below are selected from a list of 120 Experts worldwide ranked by ideXlab platform
Akira Yabe - One of the best experts on this subject based on the ideXlab platform.
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surface modification of Fluorocarbon Polymers by vacuum uv excimer lamp irradiation in reactive gas atmosphere
Japanese Journal of Applied Physics, 1996Co-Authors: J Heitz, Hiroyuki Niino, Akira YabeAbstract:Irradiation of poly(tetrafluoroethylene) (PTFE) and poly(tetrafluoroethylene- co-hexafluoropropylene) (FEP) polymer films in an ammonia or hydrazine atmosphere with vacuum UV light resulted in a hydrophilic surface, where abstraction of fluorine atoms and introduction of nitrogen, oxygen, and hydrogen atoms occurred. We used Kr2* and Xe2* excimer lamps at wavelengths of 172 nm and 146 nm, respectively. The reaction mechanism for chemical surface modification is discussed on the basis of the results of X-ray photoelectron spectroscopy, secondary ion mass spectrometry, scanning electron spectroscopy, and attenuated total reflection Fourier transform infrared spectroscopy analyses.
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Chemical surface modification of Fluorocarbon Polymers by excimer laser processing
Applied Surface Science, 1996Co-Authors: Hiroyuki Niino, Akira YabeAbstract:Abstract Surface of poly(tetrafluoroethylene) [PTFE] film was modified chemically by an ArF excimer laser-induced reaction in a hydrazine gas atmosphere. The polymer surface modified upon the irradiation of 1000 pulses at 27 mJ cm −2 , which was a fairly lower fluence than the ablation threshold for usual polymer films, showed hydrophilicity (contact angle for water: 30°) enough to be metallized by chemical plating. The mechanism for chemical surface modification was investigated by FTIR, XPS, and SIMS analyses. The laser-treated PTFE film was metallized by a chemical plating process. These processes will be used to fabricate printed wiring boards for high frequency electronics.
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surface modification and metallization of Fluorocarbon Polymers by excimer laser processing
Applied Physics Letters, 1993Co-Authors: Hiroyuki Niino, Akira YabeAbstract:The surface chemical modification of poly(tetrafluoroethylene) and poly(tetrafluoroethylene‐ co‐hexafluoropropylene) films was carried out in hydrazine gas photolyzed with ArF excimer laser irradiation. The contact angle of the modified surfaces with water changed from 130° to 30° due to the reaction with hydrazine. Nitrogen on the surface was detected with x‐ray photoelectron spectroscopy, suggesting that amino groups were introduced onto the surface. In addition, on the basis of hydrophilic behavior, we succeeded in selective‐area electroless plating of nickel metal on the chemically modified surface.
Richard J Lagow - One of the best experts on this subject based on the ideXlab platform.
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direct fluorination of nitrogen containing ladder Polymers two new graphitic Fluorocarbon Polymers
Chemistry of Materials, 1993Co-Authors: Joel J Kampa, Richard J LagowAbstract:Paracyanogen and pyrolyzed poly(acrylonitrile) have been perfluorinated using elemental fluorine and have retained their polymeric fused ring structures. The two new materials produced by this method were characterized by infrared spectroscopy, electron impact mass spectrometry, elemental analysis, iodometric titration, and thermogravimetric analysis. Some chemical and physical properties are discussed as well as several possible applications in light of the discussed properties of these materials. 21 refs., 4 figs., 3 tabs.
V J Novotny - One of the best experts on this subject based on the ideXlab platform.
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quantitative secondary ion mass spectrometry of Fluorocarbon Polymers
Surface Science, 1991Co-Authors: M R Lorenz, V J Novotny, V R DelineAbstract:Abstract Secondary ion mass spectrometry (SIMS) is used to measure quantitatively the thickness of thin (6–160 A) polyperfluoroether films on silicon and gold surfaces. Linear relationship between ellipsometrically measured thicknesses and integrated SIMS signals is demonstrated. Time dependence of SIMS signals indicates that the polymeric films have a uniform thickness down to the thinnest layers studied. In the lower limit, the Fluorocarbon Polymers have extended, flat conformation due to polymer-substrate interactions. Sputtering yield and effective sputtering depth of oxygen ions are determined for these liquid Polymers. It is also shown that organic adsorbates reside between the solid surface and the low surface tension Fluorocarbon films.
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molecular conformation and disjoining pressure of polymeric liquid films
Journal of Chemical Physics, 1991Co-Authors: Mathew C Mate, V J NovotnyAbstract:Atomic force microscopy, angle resolved x‐ray photoelectron spectroscopy, and ellipsometry are applied to study the conformation of Fluorocarbon Polymers in molecularly thin liquid films, 5–130 A thick, on solid surfaces. The combination of these techniques shows that the physisorbed Polymers at the solid surface have an extended, flat conformation. In addition, the disjoining pressure of these liquid films is determined from atomic force microscopy measurements of the distance needed to break the liquid meniscus that forms between solid surface and force microscope tip. For a monolayer thickness of ∼7 A, the disjoining pressure is ∼5 MPa, indicating strong attractive interaction between the polymer molecules and the solid surface. The disjoining pressure decreases with increasing film thickness in a manner consistent with a strong attractive van der Waals interaction between the liquid molecules and the solid surface.
Eric J Munson - One of the best experts on this subject based on the ideXlab platform.
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high resolution variable temperature mas 19f nmr spectroscopy of Fluorocarbon Polymers
Macromolecules, 1997Co-Authors: Paul K Isbester, Thomas A Kestner, Eric J MunsonAbstract:It is shown that a combination of high MAS rates and high temperature results in olid state 19 F NMR spectra of comparable resolution to solution state 19 F NMR spectra. This appears to be a promising technique for routine qualitative and accurate quantitative analysis of intractable fluoroPolymers which cannot be easily analyzed by other methods
Hiroyuki Niino - One of the best experts on this subject based on the ideXlab platform.
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surface modification of Fluorocarbon Polymers by vacuum uv excimer lamp irradiation in reactive gas atmosphere
Japanese Journal of Applied Physics, 1996Co-Authors: J Heitz, Hiroyuki Niino, Akira YabeAbstract:Irradiation of poly(tetrafluoroethylene) (PTFE) and poly(tetrafluoroethylene- co-hexafluoropropylene) (FEP) polymer films in an ammonia or hydrazine atmosphere with vacuum UV light resulted in a hydrophilic surface, where abstraction of fluorine atoms and introduction of nitrogen, oxygen, and hydrogen atoms occurred. We used Kr2* and Xe2* excimer lamps at wavelengths of 172 nm and 146 nm, respectively. The reaction mechanism for chemical surface modification is discussed on the basis of the results of X-ray photoelectron spectroscopy, secondary ion mass spectrometry, scanning electron spectroscopy, and attenuated total reflection Fourier transform infrared spectroscopy analyses.
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Chemical surface modification of Fluorocarbon Polymers by excimer laser processing
Applied Surface Science, 1996Co-Authors: Hiroyuki Niino, Akira YabeAbstract:Abstract Surface of poly(tetrafluoroethylene) [PTFE] film was modified chemically by an ArF excimer laser-induced reaction in a hydrazine gas atmosphere. The polymer surface modified upon the irradiation of 1000 pulses at 27 mJ cm −2 , which was a fairly lower fluence than the ablation threshold for usual polymer films, showed hydrophilicity (contact angle for water: 30°) enough to be metallized by chemical plating. The mechanism for chemical surface modification was investigated by FTIR, XPS, and SIMS analyses. The laser-treated PTFE film was metallized by a chemical plating process. These processes will be used to fabricate printed wiring boards for high frequency electronics.
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surface modification and metallization of Fluorocarbon Polymers by excimer laser processing
Applied Physics Letters, 1993Co-Authors: Hiroyuki Niino, Akira YabeAbstract:The surface chemical modification of poly(tetrafluoroethylene) and poly(tetrafluoroethylene‐ co‐hexafluoropropylene) films was carried out in hydrazine gas photolyzed with ArF excimer laser irradiation. The contact angle of the modified surfaces with water changed from 130° to 30° due to the reaction with hydrazine. Nitrogen on the surface was detected with x‐ray photoelectron spectroscopy, suggesting that amino groups were introduced onto the surface. In addition, on the basis of hydrophilic behavior, we succeeded in selective‐area electroless plating of nickel metal on the chemically modified surface.