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Aging Study of a Paste Explosive Based on RDX/RTV (Cyclotrimethylenetrinitramine/Room Temperature Vulcanizing) Silicone Using Rheological Property

  • Macromolecular Compounds and Polymeric Materials
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Abstract

A new extrudable and paste explosive based on cyclotrimethylenetrinitramine (RDX) explosive and a medical grade and uncured room temperature vulcanizing silicone rubber is developed and its rheological properties are experimentally studied in accelerated aging process at temperatures of 50, 60, and 70°C. Viscosity and shear stress of the unaged and aged samples are measured in the shear rate range of 10–3 to 100 s–1 in times of 30, 60, 90, 120, and 150 days. The studies showed that the apparent viscosity of the aged samples reduces with increasing of temperature and time of aging. The parameter of “n < 1” (fluid flow behavior index) is obtained by using power law in domain of 10–3 to 1 s–1 that showed a non-Newtonian and pseudoplastic behavior for aged and unaged samples. Also, the kinetic of viscosity loss of the samples is studied by using pseudo-first order model. The kinetic rate constants are obtained 1.2 × 10–4, 1.9 × 10–4, and 2.7 × 10–4 h–1 at temperatures of 50, 60, and 70°C, respectively. The activation energy of viscosity loss process is obtained 10896.7 kJ mol–1 by using Arrhenius equation. Multiple linear regression (MLR) method is used to extract of a model for prediction of viscosity of the aged samples. The regression equation is obtained Y = 3.66 – 0.44X1 – 0.02 × 0.1X2 – 0.01X3 with coefficient of regression (R2) value 0.97. Where, Y, X1, X2, and X3 are log (viscosity), log (shear rate), aging time and aging temperature, respectively. The reliability of the proposed model is confirmed by statistical parameters.

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ACKNOWLEDGMENTS

We would like to thank the research committee of Malek Ashtar University of Technology (MUT) for supporting this work.

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Authors and Affiliations

  1. Faculty of Applied Sciences, 83145/115, Malek Ashtar University of Technology, Iran

    Hamid Reza Pouretedal, Sajjad Damiri, Sheida Nickmehr & Maryam Kazemi

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  1. Hamid Reza Pouretedal
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  2. Sajjad Damiri
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  3. Sheida Nickmehr
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Correspondence to Hamid Reza Pouretedal, Sajjad Damiri, Sheida Nickmehr or Maryam Kazemi.

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Pouretedal, H.R., Damiri, S., Nickmehr, S. et al. Aging Study of a Paste Explosive Based on RDX/RTV (Cyclotrimethylenetrinitramine/Room Temperature Vulcanizing) Silicone Using Rheological Property. Russ J Appl Chem 94, 1267–1274 (2021). https://doi.org/10.1134/S1070427221090093

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