K. Katoh, Satoru Yoshino, S. Kubota
Oct 1, 2007
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Journal
Propellants, Explosives, Pyrotechnics
Abstract
The effects of 3-dodecylsulfanyl-propionic acid 3-(3-dodecylsulfanyl-propionyloxy)-2,2-bis-(3-dodecylsulfanyl-propionyl-oxymethyl)-propyl ester (SO), 3,9-bis-octadecyloxy-2,4,8,10-tetraoxa-3,9-diphospha-spiro[5,5]undecane (POf), and 3,9-bis-(2,6-di-tert-butyl-4-methyl-phenoxy)-2,4,8,10-tetraoxa-3,9-diphospha-spiro[5,5]undecane (POp), which are used as antioxidants for polymers, on the degradation of nitrocellulose (NC) were investigated under isothermal storage conditions at 393 K with a microcalorimeter. The result indicated that SO/NC and POf/NC accelerated the heat release when compared with NC without an antioxidant, whereas the heat release behavior of NC/POp was similar to that of NC without an antioxidant. In the case of SO/NC and POf/NC, the heat release was observed in the presence of O2, whereas it was not observed in a N2 atmosphere. The SO content in SO/NC and PO content in POf/NC increased with the storage time. According to this behavior, it can be explained that sulfuric acid or phosphoric acid, which originates from SO or POf, accelerates the autoxidation of NC.