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This digital document is an article from Polymer Engineering and Science, published by Thomson Gale on December 1, 2005. The length of the article is 5263 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.

From the author: Recently introduced perfluorinated polyether rubbers have been found to be useful materials for use as o-rings in harsh environments. They have a very broad range of thermal utility, -55[degrees]C to 200[degrees]C, and exhibit strong resistance to harsh chemical environments over the entire temperature range. The data presented here demonstrate the excellent high and low temperature performance of perfluorinated polyether rubbers after extended exposures to jet fuel and synthetic hydraulic fluids. Demonstration of an appreciable degree of retained sealing force by molded o-rings down to -40[degrees]C is shown in a compression stress relaxation device. Perfluorinated polyether o-rings are demonstrated to offer significant improvement in performance over current nitrile-based o-ring materials. POLYM. ENG. SCI., 45: 1622-1629, 2005. [c] 2005 Society of Plastics Engineers

Citation Details
Title: Hydrocarbon stability of perfluorinated polyether rubbers at elevated temperatures.
Author: D.M. Bigg
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: December 1, 2005
Publisher: Thomson Gale
Volume: 45 Issue: 12 Page: 1622(8)

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This digital document is a journal article from Desalination, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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This digital document is a journal article from Chemosphere, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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A rapid and simple method for separating and determining various environmentally harmful perfluorocarboxylic acids and perfluorosulfonates was successfully developed using high- performance liquid chromatography with conductimetric detection, for product and waste management of these compounds at manufacturing and processing sites. Compounds having C"3-C"8 perfluoroalkyl groups were separated using a Tosoh TSKgel Super-ODS column and a mobile phase consisting of a mixture of methanol and aqueous NaH"2PO"4 at several mixing ratios. The best detection limits for the compounds ranged from 0.12 to 0.66 mgl^-^1 (ppm), and linear calibration graphs were obtained up to 87-109 mgl^-^1. The combination of this method with concentration of the sample by solid-phase extraction with cartridges based on styrene-divinylbenzene-copolymer enabled the determination of ~50 @mgl^-^1 (ppb) for compounds with C"4-C"8 perfluoroalkyl groups. This method was successfully used to monitor the artificial decomposition of the perfluorocarboxylic acid n-C"4F"9COOH induced by a photocatalyst. .
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This digital document is an article from Fiber Optics Weekly Update, published by Information Gatekeepers, Inc. on June 25, 2004. The length of the article is 1214 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.

Citation Details
Title: Manufacture of perfluorinated plastic optical fibers.(White Paper)
Author: Whitney R. White
Publication:Fiber Optics Weekly Update (Newsletter)
Date: June 25, 2004
Publisher: Information Gatekeepers, Inc.
Volume: 24 Issue: 26 Page: 7(2)

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This digital document is a journal article from International Journal of Hygiene and Environmental Health, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Perfluorinated chemicals (PFCs) are used in a wide variety of consumer products. Major fields of application include surfactants, surface protection (e.g., for textiles, carpets, and upholstery), paper treatment (e.g., for food packages), and lubricants. Perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) are raw materials or manufacturing aids for some PFCs and can be released of those by biotic and/or metabolic decomposition. Due to their widespread use, persistence and bioaccumulative properties they are taken up by the general population from different sources. This might be a problem for environmental medicine because in animal studies PFOS and PFOA provoked various types of cancer and showed developmental toxic potential besides other adverse health effects. We determined the PFOS and PFOA plasma concentrations of 105 non-smokers out of the German general population as a first estimate of the exposure situation in Germany. We employed an analytical method based on serum protein precipitation followed by HPLC with MS/MS-detection. The median plasma concentrations of all participants were 22.3 and 6.8@mg/l, the 95th percentiles 54.3 and 14.6@mg/l for PFOS and PFOA, respectively. These values are comparable with those of other biomonitoring studies. In our study, men were higher burdened both with PFOS (median: 27.1 vs. 19.9@mg/l) and PFOA (median: 8.3 vs. 5.8@mg/l) than women. No significant influence of age on PFOS and PFOA plasma concentrations could be observed. A strong correlation (r=0.82) between PFOS and PFOA plasma levels indicates the same exposure sources. The ubiquitous internal exposure of the general population to PFOS and PFOA must lead to further activities primarily regarding clarification of sources, metabolism, pharmacokinetics, and health effects. .
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This digital document is a journal article from Desalination, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Short-side-chain Hyflon(R) perfluorinated ionomer based membrane was investigated as electrolyte for high temperature direct methanol fuel cells. A fuel cell performance approaching 300 mW cm^-^2 was achieved at 140^oC in the presence of 1M methanol and air feed. Stable electrochemical performance was achieved indicating suitable perspective for high temperature operation of Hyflon(R) membrane. .
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