Use of surfactants in the suspension polymerization of fluorinated monomers for preparing fluoropolymers containing hydrogen, said surfacants having the general formula:
Rf-[L-(OCHR1-CHR2)m-OZ)]i
wherein:
i is equal to 1 or 2;
m is an integer comprised between 4 and 60;
L can be chosen between: -(CFY-CO-O)pR'- and
-(CFY-CO-NH)pR'-
wherein p is an integer equal to 0 or to 1;
Y = F, CF3; R'= alkylic radical C1-C5, linear or branched when possible;
R1, R2 can be both H or the former H and the latter CH3;
Z can be H, alkyl radical C1-C3, linear or branched when possible; or (CH2)nOH with n an integer from 1 to 6;
Rf is a perfluoroalkylic radical or a perfluoropolyether radical, having a number average molecular weight comprised between 250 and 1500.
在含
氟单体的悬浮聚合中使用表面活性剂制备含氢
氟聚合物,所述表面活性剂具有通式:
Rf-[L-(OCHR1-CHR2)m-OZ)]i
其中
i 等于 1 或 2;
m 是介于 4 和 60 之间的整数;
L 可以在以下两者之间选择-(CFY-CO-O)pR'-和
-(CFY-CO-NH)pR'-和
其中 p 是等于 0 或 1 的整数;
Y=F、
CF3; R'=烷基 C1-C5,可能时为直链或支链;
R1、R2 可以都是 H,或者前者是 H,后者是
CH3;
Z 可以是 H、C1-C3 直链或支链烷基(如有可能)或 (
CH2)nOH,其中 n 为 1-6 之间的整数;
Rf 是
全氟烷基或
全氟聚醚基,其平均分子量介于 250 和 1500 之间。