摘要:
A method for preparing fluorinated carboxylic acids and theirs salts is described comprising subjecting a fluorinated to at least one first and at least one second oxidizing agent to produce a highly fluorinated carboxylic acid or their salts. The first oxidizing agent is a compound that can be converted, by action of the second oxidizing agent, into a reactive species capable of oxidizing the fluorinated alcohol.
摘要:
There is provided a curable composition comprising: a) fluoropolyethers having a molecular weight of from about 400 g/mole up to about 20,000 g/mole and containing moieties selected from (—(CF2)4O—), (—(CF2)2O—), (—CF2O—) or combinations thereof and further containing at least one nitrile group at a terminal position or at a position that is adjacent to the terminal position; and b) one or more curing agents selected from non-fluorinated compounds containing one or more functional group linked to a common residue, said residue containing at least three carbon atoms wherein the functional groups are selected from primary amines, secondary amines and functional groups that generate primary or secondary amines upon heat treatment, wherein the composition can be cured by generating groups having a triazine structure. Also provided are cured composition, methods of making cured compositions, articles made by curing the cured compositions and methods of making articles using the curable composition.
摘要:
Copolymers containing at least one perfluoropolyether segment and at least one polydiorganosiloxane segments are described. The copolymers further contain multiple aminooxalylamino groups that link the various segments together. Methods of making the copolymers are also described.
摘要:
There is provided a curable fluoroelastomer composition comprising i. a first compound which comprising repeating units derived from a fluorinated olefin and further comprising at least one functional group, ii. a second compound comprising repeating units selected from (—C4F8O—), (—C2F4O—) or (—CF2O) or a combination thereof and further containing at least one functional group capable of reacting with the at least one functional group of the first compound either directly or in the presence of a curing compound to form a triazine unit, wherein the composition after curing by forming triazine units has a glass transition temperature of less than −60° C. Also provided are shaped articles comprising the cured compositions, methods of making cured compositions and methods for making shaped articles.
摘要翻译:提供了可固化的含氟弹性体组合物,其包含i。 包含衍生自氟化烯烃的重复单元并且还包含至少一个官能团的第一化合物,ii。 包含选自(-C 4 F 8 O-),(-C 2 F 4 O-)或(-CF 2 O)的重复单元或其组合的第二化合物,并且还含有至少一个能够与第一化合物的至少一个官能团反应的官能团 直接或在固化化合物存在下形成三嗪单元,其中通过形成三嗪单元固化后的组合物具有小于-60℃的玻璃化转变温度。还提供了包含固化组合物的成型制品, 制成固化组合物和制造成型制品的方法。
摘要:
A catalyst is preparable from a first component represented by R′C(CF2R)O− Q+ and a second component (NCCFR″)bZ. The catalyst may be combined with a fluoropolymer having nitrogen-containing cure-sites to form a curable composition that is useful for preparing fluoroelastomer compositions.
摘要:
A method is provided for making a crosslinked polymer electrolyte, typically in the form of a membrane for use as a polymer electrolyte membrane in an electrolytic cell such as a fuel cell, by trimerization of nitrile groups contained on groups pendant from the polymer. The resulting polymer electrolyte membrane comprises a highly fluorinated polymer comprising: a perfluorinated backbone, first pendent groups which comprise sulfonic acid groups, and crosslinks comprising trivalent groups according to the formula: The first pendent groups are typically according to the formula: —R1—SO3H, where R1 is a branched or unbranched perfluoroalkyl or perfluoroether group comprising 1-15 carbon atoms and 0-4 oxygen atoms, most typically —O—CF2—CF2—CF2—CF2—SO3H or —O—CF2—CF(CF3)—O—CF2—CF2—SO3H.
摘要:
Silicon substrates having Si—H bonds are chemically modified using a fluorinated olefin having the formula: wherein m is an integer greater than or equal to 1; n is an integer greater than or equal to 0; Z is a divalent linking group; and Rf is a highly fluorinated organic group.