Chemical modification of nitrocellulose by grafting sodium carboxymethyl

Abstract

Introducing deterrents improves the thermal stability of nitrocellulose of propellant surface, but is accompanied with inevitable problems, such as migration, residue, smoke ame, and so on. In this paper, sodium carboxymethyl function groups were chemically grafted to nitrocellulose molecular chains by reaction of denitration and following etheri cation, which provide thermal stability, ame suppression ion without migration. Various structure characterizations were conducted and con rmed a sodium carboxymethyl-nitrocellulose (CMNC) was prepared successfully. The number of sodium carboxymethyl groups linked to nitrocellulose chains was affected by both denitration and etheri cation. The results showed that the thermal stability of CMNC improved with the increase of bearing sodium carboxymethyl groups and was better than that of original NC sample. Meanwhile, the thermal decomposition behaviors and decomposition products of CMNC are similar to that of NC at temperature of the rst DTG peak T 1 and that of CMC at temperatures of the second DTG peak T 2 . This work provided a way for designing gun propellant with progressive burning, anti-migration and ame suppression simultaneously.

Enhancing propellant performance through intermolecular interactions: cyclodextrin-based MOF loading in nitrocellulose

“…It has been proven that employing organometal salts may successfully reduce the smoke problem caused by inorganic alkali metal salts because of their low decomposition temperature. 37 Meanwhile, the easier decomposition would benefit the release of K + ions without a negative impact on the burning rate of propellants. Fig.…”

Design and fabrication of gradiently‐denitrated layer structure of seven‐hole gun propellant and its burning performance

“…The characteristic peaks at 820, 1275 and 1638 cm À 1 are attributed to the stretching vibration characteristic peaks of the nitrate group (À ONO 2 ) of nitrocellulose [30][31][32]. The absorption peak at 1160 cm À 1 corresponds to the asymmetric stretching vibration peak of β-1, 4 glycosidic bonds (CÀ OÀ C) on the nitrocellulose molecular chains [33][34][35]. The absorption peak at 3400 cm À 1 is the stretching vibration characteristic peak of hydroxyl group (À OH) in nitrocellulose [36].…”

Chaetomium elatum treatment of nitrocellulose: investigation on structural and thermal properties

“…Thus, stabilizer must be added to the propellant to prevent autocatalytic decomposition reactions. It becomes unstable and must be destroyed once the stabilizer is depleted (Katoh et al 2007; Li et al 2022;Sundaram et al 1995). This scrap propellant coupled with waste from the manufacturing of NC causes widespread contamination because of its relative recalcitrance in the environment, which will lead to concerns regarding environmental fate and impact on human and environmental health (Gladchenko et al 2016;Maksimov et al 2019;).…”