The specifics of radiation telomerization of tetrafluoroethylene in chlorinated solvents and telomer properties

Kichigina, G. A.; Kushch, P. P.; Колесникова, А. М.; Kiryukhin, D. P.

doi:10.1134/s0018143911050067

Cited by 6 publications

(6 citation statements)

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“…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].…”

Section: Resultsmentioning

confidence: 99%

“…5a shows the spectrum of the solvent [15]. The IR spectrum of the telomer produced in HFIP or other telogens [3][4][5][6] is in general identical to that of polytetrafluoroethylene [16]. The most intense absorption bands are at 1208 and 1152 cm -1 ; they belong to the stretching vibra tions ν C-F of СF 2 groups.…”

Section: Resultsmentioning

confidence: 99%

“…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].…”

mentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

“…In acetone and chlorinated solvents (carbon tetrachlo ride, chloroform, etc.) [2][3][4][5], the required dose of radiation is higher by an order of magnitude. Butyl chloride turned out to be the least effective when used as a telogen [4].…”

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confidence: 99%

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Low-temperature radiation telomerization of tetrafluoroethylene in hexafluoroisopropanol

et al. 2013

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The kinetics of low temperature (180-270 K) postradiation telomerization of tetrafluoroethylene in hexafluoroisopropanol has been investigated. The efficiency of the process is determined by the initial con centration of the monomer in the solvent and the dose of preliminary irradiation. It has been shown that the telomerization reaction proceeds via the radical mechanism during the devitrification of the system. Active centers that initiate the process and their yield at 77 K have been studied by the ESR technique. Some prop erties of the product telomers have been studied.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%