Fluoropolymers PTFE

Fluoropolymers (PTFE, FEP) were used to fabricate microstructures, which were etched by Ar ion beam etching (IBE) [225],... 

Wbitcon . [ICI Fluoropolymers] PTFE or FEP-based lubricant lubricant, thickener, extreme jnessuie agent for coatings, oils, greases. 

Fluoropolymers (PTFE and Other Polymers in the Teflon Family) 404... 

Hostaflon Fluoropolymers (PTFE, PFA, ETFE) Hoechst Celanese Corp. 

Most thermoplastics are made up of molecules with backbones consisting of a linear chain of carbon-to-carbon links. This description fits bulk polymers like polyethylene and engineering plastics like nylons it also fits the fluoropolymer PTFE (polytetrafluorethylene), an extreme case, where the chains are so compact and so long that the material cannot be melted and must be processed by sintering. 

Figure 3-10. An example of long-term tensile fatigue curves for dry nylon 6 that is 4.3 mm (0.18 in.) thick, acrylic (PMMA) that is 6.4 mm (0.25 in.) thick, and fluoropolymer (PTFE) that is 6.6 mm (0.26 in.) thick. The test frequency is at 1,800 cpm.

Figure 3-104. Relative wear versus percent by weight of fluoropolymer/PTFE.

The serendipitous discovery of polytetrafluoro-ethylene (PTFE) in 1938 by Roy Plunkett, a DuPont Company chemist, [4] began the era of fluoropolymers. PTFE has been used in thousands of applications because of its unique properties. Numerous flu-oroplastics (Fig. 3.1) have been developed since the discovery of FI FE. These plastics are produced by several companies in the US, Europe, Japan, China, India, and Russia. Ruoropolymers are divided into two classes of perfluorinated and partially fluorinated polymers. Perfluorinated fluoropolymers are homopolymers and copolymers of Tre. Some of the comonomers may contain a small amount of elements other than C or F. 

Polytetrafluoroethylene is a non-melt processible fluoroplastic. It can be foamed by a somewhat different technology than those used for melt-processible fluoropolymers. PTFE foaming is described in Sec. 11.6.2. 

For several decades, virtually all commercial and military aircraft have used signal, control and power wire and cables insulated entirely or partly with fluoropolymers. PTFE, FEP, ETFE, ECTFE, and PVDF have been used for this insulation. Critical performance characteristics include service at extreme temperatures, good fire performance, and resistance to chemicals such as hydraulic fluids, fuels, and cleaning solutions. 

The comingled hydrophobic fluoropolymers PTFE, FEP, and sometimes ethylene tetrafluoroethylene and perfluoroalkoxy resin yield different hydrophobic character and surface chemistry within the carbon-fiber matrix. This treatment creates a balance... 

High-performance engineering thermoplastics Fluoropolymers (PTFE, FEP, PVDF), liquid crystal polymers (LCP), polyphenylene oxides or ethers (PPO, PPE), aromatic polyketones (PEEK, PAEK), polyphenylene sulphides (PPS), polysulphones (PSU), polyether sulphones (PES), polyamideimides (PAI), polyetherimides (PEI), polyimides (TPI). 

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