A composition including at least one first divalent unit represented by formula: Each Rf is independently selected from the group consisting of Rf
a
—(O)
t
—CHF—(CF
2
)
n
—; [Rf
a
—(O)
t
—C(L)H—CF
2
—O]
m
—W—; Rf
b-
O—(CF
2
)
p-
; F(C
k
F
2k
)—(O—C
k
F2
k
)
P
—O—CF
2
—; and CF
3
—O—(CF
2
)
3
—(OCF(CF
3
)—CF
2
)
Z
—O-L
1
-. Each Q is independently selected from the group consisting of a bond, —C(O)—N(R
1
)—, 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(R
1
)—C(O)— or —O—C(O)—. R and R
1
are each independently selected from the group consisting of hydrogen and alkyl having from 1 to 4 carbon atoms. Rf
a
represents a partially or fully fluorinated alkyl group having from 1 to 10 carbon atoms and optionally interrupted with at least one oxygen atom. Rf
b
is selected from the group consisting of CF
3
CFH— and F(C
j
F2
j
)-. Methods of reducing surface tension of a liquid, making foams, and treating a surface using the compositions are also disclosed.
一种组合物,包括至少一个由以下式表示的第一二价单元:每个Rf独立地选择自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-;以及
CF3-O-(
CF2)3-(OCF( )-
CF2)Z-O-L1-的部分或完
全氟化烷基,其中每个Q独立地选择自键,-C(O)-N(R1)-,和-C(O)-O-的群,每个X独立地选择自烷基和芳基烷基的群,其中烷基和芳基烷基可以由至少一个醚键中断并且可以由-N(R1)-C(O)-或-O-C(O)-终止,R和R1各自独立地选择自氢和具有1至4个碳原子的烷基的群,Rfa表示具有1至10个碳原子的部分或完
全氟化烷基,且可以由至少一个氧原子中断。Rfb选择自 CFH-和F(CjF2j)-。还公开了使用该组合物减少液体表面张力、制造泡沫和处理表面的方法。