HIGH DENSITY, HIGH TEMPERATURE BINDERS FOR SOLID PROPELLANTS.
Abstract
A series of perfluoroalkylene oxide polymers containing the (OCF2CF2CF2CF2) unit has been developed. These show excellent low- and high-temperature properties; the glass transition temperature for (OCF2CF2CF2CF2)n is below -65 C. (-85 F.), in differential thermal analysis in air (or in nitrogen), no change is noted below 380 C. (716 F.), and 10% weight loss in air is observed thermogravimetrically at 515 C. (959 F.). The density of poly(perfluoroalkylene oxides) permits one to achieve the minimum target density impulse of 510 seconds (with a calculated specific impulse of over 240 seconds) at a binder level at 27%. The poly(perfluoroalkylene oxides) obtained in the earlier contract work had carboxyl-termination of at most about 1.0. Poly(perfluoroalkylene oxides) having acyl fluoride-, ester-, amide-, and carboxyl-termination greater than two have been prepared by the photopolymerization of oxygen-containing perfluorodiacyl fluorides. The present report describes continued work with such polymers. This report also describes curing studies on model compounds and prepolymers as well as the results of thermal and hydrolytic stability determinations on cured systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1967
- Accession Number
- AD0386432
Entities
People
- J. L. Zollinger
- J. R. Throckmorton
- R. A. Mitsch
Organizations
- 3M