Synthesis and Evaluation of Curing Agents.
Abstract
Curing agents for both carboxy- and hydroxy-functional prepolymers have been investigated. A series of new di- and trifunctional aziridines based on cis- and trans-2,3-dimethylaziridine have been synthesized and evaluated. These include N-acyl, N-carbamyl, N-sulfonyl, and perfluorobenzene aziridines. Reactivity was found to decrease in the following order: N-carbamyl > N-acyl > perfluorobenzene > N-sulfonyl-aziridines. Sulfonyl and perfluorobenzene aziridines require catalysts having higher catalytic activity than Zr(AA)4. N-carbamyl and N-acyl 2,3-dimethylaziridines were evaluated in CTPB propellants. Considering relative stability, stoichiometry and reaction rate, it was concluded that the trimesoyl (trans-2,3-dimethyl aziridine)3/isophthaloyl(trans-2,3-dimethyl aziridine)2 is the best combination of tri- and diaziridines for CTPB propellant use of those synthesized and tested on this program. Two pure triisocyanates have been isolated from commercial sources and evaluated in gumstocks and propellants. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1970
- Accession Number
- AD0882728
Entities
People
- A. H. Muenker
- C. A. Rowe
- C. Gustavson
- J. Linsk
- P. E. Wei