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Synthesis and Evaluation of Curing Agents.
ESSO RESEARCH AND ENGINEERING CO LINDEN N J GOVERNMENT RESEARCH LAB
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 ZrAA4. 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 aziridine3isophthaloyltrans-2,3-dimethyl aziridine2 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
Final technical rept. 4 Mar 68-2 Sep 70,
Prepared in cooperation with Lockheed Propulsion Co., Redlands, Calif.