Perfluoroalkoxy alkane

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Published on November 14, 2021 6:16:44 AM ● Video Link: https://www.youtube.com/watch?v=4N_SzpvctMs

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Perfluoroalkoxy alkanes (PFA) are fluoropolymers. They are copolymers of tetrafluoroethylene (C2F4) and perfluoroethers (C2F3ORf, where Rf is a perfluorinated group such as trifluoromethyl (CF3)). The properties of these polymers are similar to those of polytetrafluoroethylene (PTFE). Compared to PTFE, PFA has better anti-stick properties and higher chemical resistance, at the expense of lesser scratch resistance. Unlike with PTFE, the alkoxy substituents allow the polymer to be melt-processed.
On a molecular level, PFA polymers have a smaller chain length and higher chain entanglement than other fluoropolymers. They also contain an oxygen atom at the branches. This results in materials that are more translucent and have improved flow and creep resistance, with thermal stability close to or exceeding PTFE. Thus, PFA is preferred when extended service is required in hostile environments involving chemical, thermal, and mechanical stress. PFA offers high melt strength, stability at high processing temperatures, excellent crack and stress resistance and a low coefficient of friction. Similarly enhanced processing properties are found in fluorinated ethylene propylene (FEP), the copolymer of tetrafluoroethylene and hexafluoropropylene. However FEP is ten times less capable of withstanding repeated bending without fracture than PFA.Common trademarks include Teflon-PFA, Hostaflon-PFA and Chemfluor.

Source: https://en.wikipedia.org/wiki/Perfluoroalkoxy_alkane
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