Compositional and Microstructural Analysis of Tetrafluoroethylene Copolymers by Molten-State 19F-NMR

• Published in: Nippon Kagakukai shi (1972) Vol. 1995; no. 1; pp. 30 - 34
• Main Authors: YONEMORI, Shigeaki, JITSUGIRI, Yukio, OGAWA, Takao
• Format: Journal Article
• Language: English
• Published: Tokyo Japan Science and Technology Agency 1995
• ISSN: 0369-4577; 2185-0925
• DOI: 10.1246/nikkashi.1995.30

An analytical method of commercial tetrafluoroethylene copolymer was investigated by high-field magnetic 19F-NMR (376.4 MHz) in their molten state at high temperatures, since the resins were hardly soluble in any solvent. Measuring conditions were optimized; the probe temperature was set to about 20°C higher than the melting point of the resin and rod form was preferable to powdered form. In tetrafluoroethylene-heptafluoropropyl trifluorovinyl ether and tetrafluoroethylene-hexafluoropropy lene copolymers, identification of 1.5 mol% of comonomers were possible. Termonomers of three kinds of ethylene-teterafluoroethylene copolymers were assigned by the proposed method and the microstruc ture of the resins were discussed. The ethylene-ethylene sequence was directly confirmed by moltenstate 1H-NMR.