Storage Behavior of BITA and Initial Propellant Properties yoDecrease in Aziridine Content Initial Propellant Profierties yn,b yb, E,, after 2 Days at B I T A Curing Agent 13ijQF. P.s.I. yo yo fi.s.2. Table V.
Monomer from lot 19A '7.2 Original lot 19A 21 .8 a Nominal maximum stress. Elongation at maximum stress.
102 132
36 31
47 35
427 630
( 2 ) Brewer, P. I., Nature 188,935 (1960). ( 3 ) Cortis-Jones~B.y "9' 272 (1961). (4) Determann, H., Angew. Chem. 3, 608 (1964). (5) Flodin, P., Porath, J. (to Aktiebolaget Pharmacia), Brit. Patent 865,265 (April 12, 1961); U. S. Patent 3,002,823 (Oct. 3, 1961). (6) Jay, R. R., Anal. Chem. 36, 667 (1964). (7) Lathe, G. H., Ruthven, C. R. J., Biochem. J . 62,665 (1956). (8) Moore, J. C., J . Polymer Sci. A2, 835 (1964). (9) Porath, J., Flodin, P., Nature 183,1657 (1959). (10) Schlitt, R. C., Anal. Chem. 35, 1063 (1963). ( 1 1 ) Vaughan, M. F., Nature 188, 55 (1960). (12) Wheaton, R. M., Bauman, W. C., Ann. N . Y. Acad. Sci. 57,159 (1953).
literature Cited
(1 ) Aerojet-General Corp., "Solid Propellant Structural Integrity Investigations, Propellant-Liner Bond Studies," Rept. (U), 0752-81F (25 March 1964, Contract AF 04(611)-8538 (confidential)].
RECEIVED for review May 2, 1966 ACCEPTEDAugust 15, 1966 Research supported by the Rocket Propulsion Laboratory, Edwards, Calif., under Contract AF 04(611)-8538.
OXIDATION PRODUCTS IN A N OXYGEN= BLOWN KUWAIT ASPHALT PAUL G. CAMPBELL AND JAMES R . W R I G H T
National Bureau of Standards, Washington, D. C.
A Kuwait asphalt flux, which i s ordinarily very difficult to harden b y an air-blowing process, was treated with oxygen to prepare a coating-grade asphalt. Oxidative changes were measured b y increase in softening point and b y infrared spectroscopy. The infrared spectra of the coating-grade asphalt to which model organic compounds were added were compared with the spectrum of the original asphalt. The principal oxygen-containing products formed during oxidation and photooxidation, as assigned b y infrared analysis and several colorimetric methods, were acids, aldehydes, ketones, and peroxides, which confirmed previous findings with asphalts from other geographical sources. HE treatment of an asphalt flux with ozone and oxygen to Tproduce a coating-grade material has been reported by Campbell and Wright (3) who showed that both oxygen and ozone accelerated the hardening (oxidation) process under mild reaction conditions. The products formed had high softening points and also high penetrations. Studies were made with southeastern U.S.A. and catalyzed and uncatalyzed California Coastal fluxes. As an extension to the work presented previously, a Middle Eastern asphalt, a Kuwait flux, was evaluated. Ordinarily, it is very difficult to harden this flux into a coating-grade product using a normal air-blowing process. The principal objective of the present work was to treat the Kuwait asphalt flux with oxygen at relatively mild temperatures (
