Radiation-Induced Emulsion Copolymerization of Tetrafluorethylene with Propylene. The Behavior of the HF Formed
作者:
Nobutake Suzuki,
Jiro Okamoto,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1975)
卷期:
Volume 9,
issue 2
页码: 285-297
ISSN:0022-233X
年代: 1975
DOI:10.1080/00222337508068663
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The radiation-induced emulsion copolymerization of tetrafluoroethylene with propylene was carried out at room temperature in the presence of gaseous monomers. The formation of hydrofluoric acid in the course of polymerization was observed. The amount of HF formed increased linearly with the irradiation time at various dose rates in the early stage. The tendency was similar to that of time-polymer yield curves. The rate of HF formation was proportional to the first order of the dose rate. The amount of HF formed increased in the presence of oxygen and decreased remarkably above 1 wt% emulsifier, while the polymer yield decreased in the presence of oxygen and increased with the emulsifier concentration. A remarkable decrease in the amount of HF formed in higher emulsifier concentration is mainly attributable to chemical absorption or electrostatic capture of H+ion on polymer particles produced. Hydrofluoric acid is mainly formed by reaction between primary products (eaq−and H) from the radiolysis of water and organic fluoride (tetrafluoroethylene and emulsifier), and is little formed by reaction between primary products and copolymer produced. The G value of HF formation was in the order of emulsifier-water system > suspension polymerization > emulsion polymerization, while the polymer yield was in the order of emulsion polymerization > suspension polymerization.
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