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<p>In order to study the effect of near-neutral inorganic salts on the thermal decomposition of nitrocellulose, we chose K₂SO₄ as the research object and explored the changes of TG/DSC curves of the samples under different atmospheres by synchronous analyzer. The apparent activation energy values of the samples were calculated by multi iso-conversional methods, including Kissinger–Akahira–Sunose, Flynn–Wall–Ozawa, Friedman, Tang, modified Coats–Redfern and advanced Vyazovkin method. It was found that the activation energy of the samples was more stable between the conversion rates of 0.04–0.74. Subsequently, the main reaction zone of the samples was modeled by the TAS method, while the whole reaction process of the samples was analyzed by the probable model, the Malek method. It was found that the model of the main reaction zone was Avrami–Erofeev model, while the most probable model of thermal degradation was obtained as Sestak–Berggren model. Subsequently, a reconstruction of the reaction mechanism model was undertaken based on the experimental values of the reaction mechanism function at different heating rates. The resulting model was found to be more effective in describing the real reaction process. As a result of this study, there are certain guiding principles that can be applied to the pyrolysis reaction model and to the actual production process of nitrocellulose.</p>

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Study on the mechanism and thermal spontaneous of nitrocellulose by near-neutral inorganic salt

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Xingliang Wu,
  • Guozhong Xu,
  • Mi Li,
  • Lin Jiang

摘要

In order to study the effect of near-neutral inorganic salts on the thermal decomposition of nitrocellulose, we chose K₂SO₄ as the research object and explored the changes of TG/DSC curves of the samples under different atmospheres by synchronous analyzer. The apparent activation energy values of the samples were calculated by multi iso-conversional methods, including Kissinger–Akahira–Sunose, Flynn–Wall–Ozawa, Friedman, Tang, modified Coats–Redfern and advanced Vyazovkin method. It was found that the activation energy of the samples was more stable between the conversion rates of 0.04–0.74. Subsequently, the main reaction zone of the samples was modeled by the TAS method, while the whole reaction process of the samples was analyzed by the probable model, the Malek method. It was found that the model of the main reaction zone was Avrami–Erofeev model, while the most probable model of thermal degradation was obtained as Sestak–Berggren model. Subsequently, a reconstruction of the reaction mechanism model was undertaken based on the experimental values of the reaction mechanism function at different heating rates. The resulting model was found to be more effective in describing the real reaction process. As a result of this study, there are certain guiding principles that can be applied to the pyrolysis reaction model and to the actual production process of nitrocellulose.