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Stabilized tetrafluoroethylene-fluoroolefin copolymers having methyl ester end-groups and process for producing same

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TLDR
Stabilized tetrafluoroethylene-fluoroolefin copolymers having methyl ester end-groups were produced by as discussed by the authors, where the polymer was contacted with methanol at from about 65-200* C for the carboxylic acid end groups and from about 0-200 * C for acid fluoride end groups.
Abstract
Stabilized tetrafluoroethylene-fluoroolefin copolymers having methyl ester end-groups are produced from tetrafluoroethylenefluoroolefin copolymers having carboxylic acid end-groups and acid fluoride end-groups by contacting the polymer with methanol at from about 65-200* C. for the carboxylic acid end-groups and from about 0-200* C. for the acid fluoride end-groups and then drying the stabilized polymer.

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PatentDOI

Nonaqueous polymerization of fluoromonomers

TL;DR: In this paper, a process for making fluorinated polymers and copolymers having stable end groups is described, and the process includes contacting a fluoromonomer, an initiator capable of producing stable groups on the polymer chain, and a polymerization medium comprising carbon dioxide, and polymerizing the fluoronomer.
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Method of stabilizing fluoropolymer

TL;DR: In this article, the stable groups of a melt-processable fluoropolymer can be stabilized by melt-kneading, which is characterized by having stable groups in a kneader having a stabilization zone satisfying the following requirements: (1) an oxygen-containing gas is present in the stabilization zone and (2) water was present in that zone.
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