Radiation-initiated telomerization of tetrafluoroethylene in 1,2-dibromotetrafluoroethane

Low-temperature radiation telomerization of tetrafluoroethylene in hexafluoroisopropanol

“…The telomerization process apparently begins in the melting region, in which the molecular mobility appears, although effective decay of active centers takes place in this region. Note that 100% monomer conversion is observed at room temperature under these conditions (monomer concentration and dose) [6]. A similar result was obtained with the CCl 4 + 2.15 mol/L TFE system (Fig.…”

“…A number of chemically different telogens in which telomer formation during irradiation of the reaction mixture at room temperature occurs with varying effi ciency was chosen to carry out low temperature radi ation telomerization of TFE: hexafluoroisopropanol (HFIP), carbon tetrachloride, butyl chloride, and Freon 114B2 [4][5][6].…”

“…Irradiation of solutions of tetrafluoroethylene (TFE) with 60 Co γ rays in various solvents (telogens) at room temperature results in the formation of telomers with the general formula R 1 (C 2 F 4 ) n R 2 , where R 1 and R 2 are end groups consisting of fragments of telogen molecules, n is the number of TFE units in the chain [1][2][3][4][5][6][7]. The efficiency of the radiation telomerization process is determined by the monomer concentration, its solubility in the telogen, radiation dose, and the chemical nature of the solvent in which the synthesis is run [2][3][4][5][6].…”

“…The efficiency of the radiation telomerization process is determined by the monomer concentration, its solubility in the telogen, radiation dose, and the chemical nature of the solvent in which the synthesis is run [2][3][4][5][6]. Telomers formed at the same initial condi tions have a substantially different chain length, depending on the chemical nature of the telogen.…”

“…Telomers formed at the same initial condi tions have a substantially different chain length, depending on the chemical nature of the telogen. The process of radiation telomerization is the most effi cient in perfluorinated solvents (Freons) at room tem perature, in which low radiation doses (~2 kGy) are required for the complete monomer conversion [6]. In acetone and chlorinated solvents (carbon tetrachlo ride, chloroform, etc.)…”