Perfluoropropylene Oxide Research Articles

Electron-capture negative ionization calibrants for magnetic sector mass spectrometers

Fomblin [poly(perfluoropropylene oxide)], PFK (perfluorokerosene) and FC-43 (perfluorotributylamine) are investigated as mass calibrants in electron-capture negative ionization mass spectrometry on a magnetic sector hybrod mass spectrometer. This work provides exact negative ion mass tables of these three calibrants obtained using high-resolution peak matching of representative ions of the calibrants against ions of known mass. The suitability of these calibrants for full data system control in the negative ionization mode is demonstrated for the techniques of high-resolution scanning, selected ion recording and calibration of the quadrupole sector of a hybrid instrument.

The fluorination of silylated phosphites by perfluoropropylene oxide

The fluorination of silylated phosphites by perfluoropropylene oxide

ChemInform Abstract: Fluoroindenes. Part 10. Cycloaddition of Difluorocarbene to Perfluoro‐3‐methylindene and Perfluoro‐1‐methyleneindan. Thermolysis and Bromination of the Cyclopropane Derivatives Formed.

AbstractThe perfluoromethylindene (I) and the perfluoromethyleneindan (VI) react with difluorocarbene, generated in situ from perfluoropropylene oxide (II), to give the cyclopropanes (III) and (VII).

Complex refractive indexes for polymers over the infrared spectral region: Specular reflection IR spectra of polymers

AbstractA dispersion analysis is used to determine the complex refractive indexes over the infrared for the following polymeric systems: isotactic poly(methyl methacrylate), syndiotactic poly(methyl methacrylate), poly(2‐methyl‐1‐pentene)sulfone, poly(perfluoropropylene oxide), poly(pyromellitimide), poly(styrene), and poly(vinyl alcohol). These were combined with solutions of Maxwell's equations for electromagnetic radiation at interfaces in a FORTRAN computer code to model specular relection infrared spectra. Calculations and experimental data are compared to demonstrate the complicated nature of specular reflection and the ability of the modelling to simulate the observed spectra.

Irradiation of poly(perfluoropropylene oxide) by a 25-kV electron beam: electron beam induced chemistry of poly(perfluoropropylene oxide) in the absence of oxygen

Irradiation of poly(perfluoropropylene oxide) by a 25-kV electron beam: electron beam induced chemistry of poly(perfluoropropylene oxide) in the absence of oxygen

ChemInform Abstract: Irradiation of Poly(perfluoropropylene Oxide) by a 175 kV Electron Beam: The Formation and Hydrolysis of Acid Fluoride Groups.

Chemischer InformationsdienstVolume 17, Issue 52 Preparative Organic Chemistry ChemInform Abstract: Irradiation of Poly(perfluoropropylene Oxide) by a 175 kV Electron Beam: The Formation and Hydrolysis of Acid Fluoride Groups. J. PACANSKY, J. PACANSKYSearch for more papers by this authorR. J. WALTMANN, R. J. WALTMANNSearch for more papers by this authorC. WANG, C. WANGSearch for more papers by this author J. PACANSKY, J. PACANSKYSearch for more papers by this authorR. J. WALTMANN, R. J. WALTMANNSearch for more papers by this authorC. WANG, C. WANGSearch for more papers by this author First published: December 30, 1986 https://doi.org/10.1002/chin.198652122AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume17, Issue52December 30, 1986 RelatedInformation

Irradiation of poly(perfluoropropylene oxide) by a 175 KV electron beam: The formation and hydrolysis of acid fluoride groups

Poly(perfluoropropylene oxide), −(CF(CF3)CF2O)n−, was exposed to a 175kV electron beam while under a blanket of N2 at atmospheric pressure. The electron beam induced chemistry was spectroscopically analyzed using infrared techniques. The IR analysis revealed that acid fluoride groups were formed by the electron beam exposure which rapidly hydrolyzed to form a car☐ylic acid and HF. Viscosity studies on the irradiated material show that the net effect of the electron beam exposure is to initially reduce the viscosity; when the irradiated material is exposed to air the viscosity increases as a function of the time in contact with the atmosphere. These latter viscosity changes are attributed to the hydrolysis reaction.

Poly(perfluoropropylene oxide) as a reference standard for mass measurement to mass 2000

Poly(perfluoropropylene oxide) as a reference standard for mass measurement to mass 2000

Reaction of carboxylic acid fluorides and perfluoropropylene oxide with (acyloxymethyl)dimethylethoxysilanes

1. In contrast to the acid chlorides and bromides, when carboxylic and perfluorocarboxylic acid fluorides are reacted with (acyloxymethyl)dimethylethoxysilanes only the ethoxy group on the silicon atom is replaced by fluorine. 2. The formed (acyloxymethyl)dimethylfluorosilanes when reacted with acetyl bromide replace the acyloxy group by the bromine atom to give bromomethyldimethylfluorosilane. 3. (Fluoromethyl)dimethylfluorosilane was obtained by heating an (acyloxymethyl)dimethylfluorosilane with perfluoropropylene oxide.

Perfluoropropylene oxide in reactions with electrophilic reagents

1. Perfluoropropylene oxide reacts with sulfur trioxide at 150° to give two isomeric products: 1,2 perfluoropropylene sulfate and 2-oxoperfLuoropropyl fluorosulfate. A cyclic synchronous mechanism was proposed for the formation of 2-oxoperfluoropropyl fluorosulfate. 2. The reaction of water, an alcohol, or aniline with 1,2-perfluoropropylene sulfate or 2-oxoperfluoropropyl fluorosulfate gave the correspondingα-hydroxy-α-substituted perfluoropropionic acid derivatives. 3. The treatment of 1,2-perfluoropropylene sulfate or 2-oxoperfluoropropyl fluorosulfate with catalytic amounts of KF or CsF in acetonitrile or diglyme results in the evolution of SO2F2 and the formation of perfluoropyruvoyl fluoride.

Further Examination of the Reaction of Oxygen Atoms with Perfluoropropene

The reaction of oxygen atoms with C3F6 has been examined further, in both the presence and the absence of molecular oxygen, at room temperature and at 126°. The oxygen atoms were generated from the mercury-sensitized decomposition of N2O. Both (C3F6) and (O2) were varied by a factor of 10 and the lamp intensity by a factor of 200. In addition to N2, the products were CF2O, CF3CFO, C5F10[Complex chemical formula],and, in the presence of O2, C3F6O (perfluoropropylene oxide). The reaction scheme is analogous to that for C2F4 and is discussed in detail. A number of relative rate constants could be estimated, and they are tabulated. Important intermediates are CF2, CF3CF, and C3F6O* in the absence of O2, together with CF2O2 and CF3CFO2 in the presence of O2.

Reexamination of the mercury-photosensitized oxidation of perfluoropropene: some reactions of electronically excited oxygen molecules

Abstract : The mercury-photosensitized oxidation of C3F6 at room temperature, with O2 pressures in excess of 50 mm, yielded CF2O, CF3CFO, and C3F6O (perfluoropropylene oxide). The products were monitored continually during irradiation by infrared analysis. It was found that (CF2O) was equal to (CF3CFO). At (O2)/(C3F6) less than one, these yields are unity, but they drop at larger (O2)/(C3F6) ratios. The ratio (C3F6O)/(CF2O) increases linearly with C3F6 pressure, is independent of O2 pressure, and rises slightly as the intensity is lowered. A mechanism is present to account for the general features of the reaction. At high O2 pressures, electronically excited O2 is produced by mercury sensitization. By following the decline in (CF2O) when a competitive third gas was added, we could measure the relative reactivity of the electronically excited O2 with various gases. Values of this reactivity relative to C3F6 are tabulated for 15 gases. (Author)