Synthesis of block cotelomers involving a perfluorinated chain and a hydrophilic chain. Part I. Use of fluorinated telogens with trichloromethyl end groups

Abstract

Abstract The synthesis of compounds involving a perfluorinated chain and a trichloromethyl group at the end of the chain is carried out by esterifying an alcohol with trichloracetic acid or by adding CCl 4 to a perfluorinated alcohol acrylate. Cl 3 CCO 2 (CH 2 ) 2 C 6 F 13 and Cl 3 CCH 2 CHClCO 2 (CH 2 ) 2 C 6 F 13 are obtained, respectively. These telogens are both used to initiate a polyacrylamide chain, thus allowing the synthesis of new highly hydrosoluble surfactants. The transfer constant of ferric chloride to the polyacrylamide chain can be calculated by studying the kinetics of the telomerization reaction. We found C = 16 at 125°C. Telomers can be prepared in which the polymer chain contains between 10 to 1000 acrylamide units; the degree of polymerization can be precisely predicted according to the amounts of products allowed to react.