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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/cm2. The polymerization rate was shown to be proportinal to about the 0.8 power of the dose rate in the range of 2 × 104 to 105 R/hr and to be almost independent of emulsifier concentration. The molecular weight of the polymer lies in the range of 104 to 105, increases with reaction time at the initial stage, and decreases with emulsifier concentration, but is independent of the dose rate from 2 × 104 to 6 × 104 R/hr. If the emulsifier is not used, a polymer with a molecular weight as high as 1.8 × 106 to 2 × 107 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.
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Suwa et al. (1974) studied this question.
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