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  • 1 Zhejiang University Department of Chemistry Hangzhou 310027 P. R. China Hangzhou 310027 P. R. China
  • 2 Xi'an Modern Chemistry Research Institute Xi'an 710065 P. R. China Xi'an 710065 P. R. China
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Abstract  

The kinetics of the first order autocatalytic decomposition reaction of highly nitrated nitrocellulose (HNNC, 14.14%N) was studied by using thermogravimetry (TG). The results show that the TG curve for the initial 50% of mass-loss of HNNC can be described by the first order autocatalytic equation

\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$\frac{{{\text{d}}y}}{{dt}} = - 10^{16.4} \exp \left( { - \frac{{210380}}{{RT}}} \right)y - 10^{16.7} \exp \left( { - \frac{{171205}}{{RT}}} \right)y(1 - y)$$ \end{document}
and that for the latter 50% mass-loss of HNNC described by the reaction equations
\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$\frac{{dy}}{{dy}} = - 10^{16.3} \exp \left( { - \frac{{169483}}{{RT}}} \right)y\quad (n = 1)$$ \end{document}
and
\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$\frac{{dy}}{{dt}} = - 10^{16.8} \exp \left( { - \frac{{165597}}{{RT}}} \right)y^{2.61} \quad (n \ne 1)$$ \end{document}