Separation of Some Low Molecular Weight Fluorocarbons by Gas Chromatography.

Flash pyrolysis of polytetrafluoroethylene

“…The identity of the two minor peaks, due to ^2^2 * ^4 ^8 ' confirmed due to lack of • reference gases (2). Duplicate chromatograms for identical sample mixtures were reproducible within ±1,5% for major components.…”

Perfluoropropene as Scavenger in 18 F-Recoil Systems

“…4 We were not able to identify iso-C 5 F 10 as (CF 3 ) 4 C or as (CF 3 ) 2 CF-CF 2 -CF 3 . 5 Per F-heptane I and per F-heptane II are both branched heptanes of unknown structure.…”

“…Ne and CF 4 were obtained from Matheson Gas Products, C 3 F 6 and CH 2 F 2 from Peninsular Chemical Research, CHF 3 , CH 3 F and C 2 F 6 from Baker. Perfluoro-isobutene was prepared by pyrolysis of c-C 4 F g [5]. Organic purity was monitored by VPC analysis; no impurities could be detected.…”

Direct photolysis of tetrafluoroethylene at 1849 Å

“…Analysis was carried out, using a Burrell Kromo Tog Model K D vapor phase chromatograph on a 10 foot silica gel column (9), operating between 50 and 275 "C, with thermal conductivity detectors. The instrument was calibrated with known quantities of each of the perfluorocarbons found in the photolysis (apart from difluoroacetylene, which is unstable even at low concentrations (10)).…”

“…It is difficult to justify exclusively a mechanism for the formation of perfluoropropane. Reactions [7] to [9] indicate a probable pathway3 3The authors are grateful to a referee for suggesting this mechanism.…”