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Radiation‐induced emulsion polymerization of tetrafluoroethylene
Author(s) -
Suwa Takeshi,
Takehisa Masaaki,
Machi Sueo
Publication year - 1974
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1974.070180804
Subject(s) - tetrafluoroethylene , emulsion polymerization , polymerization , polymer , chain transfer , emulsion , polymer chemistry , radiolysis , chemistry , materials science , chemical engineering , radical polymerization , organic chemistry , copolymer , aqueous solution , engineering
Abstract The radiation‐induced emulsion polymerization of tetrafluoroethylene was carried out with the use of ammonium perfluorooctanoate as an emulsifier at an initial pressure of ca. 30–35 Kg/cm 2 . The polymerization rate was shown to be proportinal to about the 0.8 power of the dose rate in the range of 2 × 10 4 to 10 5 R/hr and to be almost independent of emulsifier concentration. The molecular weight of the polymer lies in the range of 10 4 to 10 5 , increases with reaction time at the initial stage, and decreases with emulsifier concentration, but is independent of the dose rate from 2 × 10 4 to 6 × 10 4 R/hr. If the emulsifier is not used, a polymer with a molecular weight as high as 1.8 × 10 6 to 2 × 10 7 is obtained. Apparently, the emulsifier and its radiolysis products act as chain transfer agents. Postirradiation polymerization was found to take place with the formation of products with increased molecular weight.