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Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 3, pp 1471–1480 | Cite as

Experimental study on the fire characteristics of typical nitrocellulose mixtures using a cone calorimeter

  • Ruichao Wei
  • Shenshi Huang
  • Que Huang
  • Dongxu Ouyang
  • Qinpei Chen
  • Richard Yuen
  • Jian Wang
Article

Abstract

To further understand the safety performance of energetic materials such as nitrocellulose (NC) mixtures, it is necessary to obtain the fire properties of commonly used NC mixtures. In the present study, an in situ calorimeter was employed to investigate the fire characteristics of pure NC, NC-plasticizer mixture and two NC-humectant mixtures, namely NC-isopropanol and NC-ethanol mixtures. The plasticizer (dibutyl phthalate) and humectants (ethanol or isopropanol) can effectively reduce the fire risk of NC. NC-plasticizer is more risky than NC-humectants in the burning process. Compared with the NC with isopropanol, the NC with ethanol exhibits higher fire risk. Also, the thermogravimetric (TG) curves of four NC samples were measured by a TG analyzer. The curves indicate that the decomposition of pure NC is more dramatic than NC mixtures, and the NC with plasticizer dibutyl phthalate can decompose in advance.

Keywords

Safety performance Nitrocellulose mixtures Fire characteristics In situ calorimeter 

List of symbols

C

The orifice flow meter calibration constant

D

Diameter

E0

Energy released per unit mass of O2 consumed (kJ kg−1)

\(\Delta H_{{{\text{c}}1}}\)

Effective heat of combustion based on maximum mass loss rate

\(\Delta H_{{{\text{c}}2}}\)

Effective heat of combustion based on average mass loss rate

mv

Evaporation content of humectant

mr

Mass loss range of decomposition of NC samples

\(\dot{m}\)

Mass loss rate

\(\dot{m}_{{{\text{O}}_{2} }}\)

Mass flow rate of O2 after the ignition of the material (kg s−1)

\(\dot{m}_{{{\text{O}}_{2} }}^{0}\)

Mass flow rates of O2 before the test (kg s−1)

\(\Delta\)p

The pressure differential of orifice meter

\(\dot{Q}\)

Heat release rate (kW)

Te

Absolute temperature of the gas at the orifice meter

Ton

Onset decomposition temperature

Tm

Maximum decomposition temperature

Subscripts

ave

Average

max

Maximum

Notes

Acknowledgements

This research was supported by the National Natural Science Foundation of China (No. 51376172) and the grant from the Research Grant Council of the Hong Kong Special Administrative Region, China (contract Grant No. CityU 11301015).

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Ruichao Wei
    • 1
    • 2
  • Shenshi Huang
    • 1
    • 2
  • Que Huang
    • 1
  • Dongxu Ouyang
    • 1
  • Qinpei Chen
    • 1
  • Richard Yuen
    • 2
  • Jian Wang
    • 1
  1. 1.State Key Laboratory of Fire ScienceUniversity of Science and Technology of ChinaHefeiPeople’s Republic of China
  2. 2.Department of Civil and Architectural EngineeringCity University of Hong KongKowloonPeople’s Republic of China

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