Ronald A. Mitsch

Infrared Spectrum of CF2

A low‐temperature infrared study of the photolysis products of CF2N2 in inert matrices has yielded the three vibrational fundamentals of the species CF2, at 668, 1102, and 1222 cm—1. Supplementary ultraviolet observations have confirmed the presence of CF2 in high concentration. Detection of the stretching fundamentals of 13CF2, present in natural abundance, has permitted an estimate of the FCF angle. The thermodynamic properties of CF2 have also been estimated. CF2 appears not to react with CO or with CO2 in a matrix environment.

Preparation and Curing of Poly (Perfluoroalkylene Oxides)

Abstract A series of functionally terminated poly(perfluoroalkylene oxides), a new class of curable, liquid, fluorinated polymers, has been prepared by the photopolymerization of perfluorooxydipropionyl fluoride, O(CF2CF2COF)2, and related perfluoroacyl fluoride monomers. Polymerization proceeds by ultraviolet-induced scission of CF2COF groups and coupling of the CF2—radicals thus formed. Polymer molecular weight and functionality increase with photolysis time. The acid fluoride-terminated polymers (Mn 1000–5000, functionality 2–5) are liquids possessing low Tg (about −60°C) and excellent, thermal stability. Other functional end groups (e.g., COOH, COOR, CH2OH, etc.) have been prepared using standard reactions.