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Molecular weight characteristics of tetrafluoroethylene–propylene copolymer produced by radiation‐induced emulsion copolymerization
Author(s) -
Yamaguchi Kouichi,
Hayakawa Naohiro,
Okamoto Jiro
Publication year - 1978
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.1978.070220920
Subject(s) - tetrafluoroethylene , copolymer , branching (polymer chemistry) , polymer chemistry , materials science , molar mass distribution , fluoride , fluorine , polymerization , emulsion , emulsion polymerization , molecule , polymer , chemistry , organic chemistry , inorganic chemistry , composite material , metallurgy
Abstract The alternating copolymers of tetrafluoroethylene and propylene produced in emulsion polymerization by radiation and by chemical initiators were fractionated and the fine structure of the molecules was examined. The correlation between M̄ n and [η] was obtained as\documentclass{article}\pagestyle{empty}\begin{document}$\left[\eta \right]=3.97\times 10^{-4} \bar{M}_n 0.639$\end{document} for the fractionated samples. The molecular structure of the copolymers was not a complicated one, such as long‐chain branching. There was no difference in molecular weight distribution and molecular structure between these copolymers. 19 F NMR measurements showed that the copolymer by radiation had a large degree of the irregularity of alternation in the sequence than that by the chemical method; the irregularity increased with increasing molecular weight in the fractionated samples. The fluorine content in the fractionated samples determined with an fluoride ion‐sensitive electrode was of similar tendency as that in the results of 19 F NMR.