摘要:
There is provided a curable fluoroelastomer composition, Also provided are shaped articles of cured compositions, methods of making cured compositions and methods for making shaped articles.
摘要:
A composition including at least one first divalent unit represented by formula: Each Rf is independently selected from the group consisting of Rfa-(O)t-CHF-(CF2)n-; [Rfa-(O)t-C(L)H-CF2-O]m-W-; Rfb-O-(CF2)p-; F(CkF2k)-(O-CkF2k)P-O-CF2-; and CF3-O-(CF2)3-(OCF(CF3)-CF2)Z-O-L1-. Each Q is independently selected from the group consisting of a bond, -C(O)-N(R1)-, and -C(O)-O-. Each X is independently selected from the group consisting of alkylene and arylalkylene, wherein alkylene and arylalkylene are each optionally interrupted by at least one ether linkage and optionally terminated by -N(R1)-C(O)- or -O-C(O)-. R and R1 are each independently selected from the group consisting of hydrogen and alkyl having from 1 to 4 carbon atoms. Rfa represents a partially or fully fluorinated alkyl group having from 1 to 10 carbon atoms and optionally interrupted with at least one oxygen atom. Rfb is selected from the group consisting of CF3CFH- and F(CjF2j)-. Methods of reducing surface tension of a liquid, making foams, and treating a surface using the compositions are also disclosed.
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.
摘要:
Described herein is a composition comprising a fluoropolymer derived from the polymerization of a polymerizable fluorinated olefinic monomer and a hydrocarbon olefin-containing perfluoro vinyl ether monomer selected from CF 2 =CFO-R f -CH=CH 2 , wherein R f is a perfluorinated group with the proviso that the R f group does not comprise 2 or 3 catenated atoms between the oxygen atom of the vinyl ether group and the vinyl group.
摘要:
Fluorinated compounds represented by formula Rf-Q-X-[Si(R) f (R 1 ) 3-f ] g . Each Rf is independently a partially fluorinated or fully fluorinated group selected from Rf a -(O) r -CHF-(CF 2 ) n -; [Rf b -(O) t -C(L)H-CF 2 -O] m -W-; CF 3 CFH-O-(CF 2 ) p -; CF 3 -(O-CF 2 ) z -; and CF 3 -O-(CF 2 ) 3 -O-CF 2 -. Methods of treating a surface or a hydrocarbon-bearing formation using the fluorinated compounds and treated articles and treated hydrocarbon-bearing formations are also disclosed.
摘要:
A method is provided for making a reinforced polymer electrolyte membrane, such as may be used in electrolytic cells such as fuel cells, by mixing a sulfonate- or sulfonyl halide-functional polymer with a bisamidine compound and subsequently trimerizing the amidine groups of the bisamidine compound to form triazine linkages. The sulfonyl halide or sulfonate groups may then be converted to sulfonic acid groups, yielding a polymer electrolyte reinforced with a polytriazine.
摘要:
A method of making a fluoropolyether elastomer containing triazine groups and having a glass transition temperature of less than -40 °C, including providing (i) one or more saturated fluoropolyethers containing repeating moieties selected from (-C 4 F 8 O-), (-C 3 F 6 O-), (-C 2 F 4 O-), (-CF 2 O-) and combinations thereof and further containing at least one functional group at a terminal carbon atom of the backbone chain, or of a side chain if present, wherein the terminal carbon atom may be a primary or secondary carbon atom and wherein the functional group is capable of reacting with a functional group of the fluorinated compound according to (ii) below to form a triazine ring, (ii) one or more fluorinated compound containing at least one perfluorinated alkyl or perfluorinated alkylene moiety wherein the carbon atoms of the perfluorinated alkyl or alkylene moiety may be interrupted by one or more oxygen atoms and wherein the fluorinated compound further contains at least one functional group capable of reacting with the functional group of the one or more fluoropolyethers to form a triazine; curing the components according to (i) and (ii) to form triazines. Further provided are cured compositions, articles comprising the cured compositions and methods of making articles.