Studies on a Novel Thermoplastic Polyurethane as a Binder for Extruded Composite Propellants

Mulage, K. S.; Patkar, R. N.; Deuskar, V. D.; Pundlik, S. M.; Kakade, S. D.; Gupta, Manoj

doi:10.1080/07370650701205964

Cited by 22 publications

(11 citation statements)

References 4 publications

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“…Polymeric binders can also improve the mechanical and chemical properties of explosives. Several polymers have been used in solid propellants during the last decades [15][16][17]. However, these polymers are mostly inert, and consequently cause significant reduction in performance.…”

Section: Introductionmentioning

confidence: 99%

Thermal Behavior and Decomposition Kinetics of RDX and RDX/HTPB Composition Using Various Techniques and Methods

Abd‐Elghany

Elbeih

Saeed

2016

Cent. Eur. J. Energ. Mater.

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Abstract:In this paper, the thermal behavior and decomposition kinetics of trinitrohexahydrotriazine (RDX) and its polymer bonded explosive (PBX) containing a hydroxyl-terminated polybutadiene (HTPB) based polyurethane binder in the ratio 80% RDX/ 20% HTPB were investigated using various experimental techniques and analytical methods. The HTPB polyurethane matrix contains other additives and was cured using hexamethylene diisocyanate (HMDI). Thermogravimetric analysis (TGA), Differential Scanning Calorimetry (DSC), Vacuum Stability Test (VST) and Ignition Delay Techniques were applied both isothermally and non-isothermally. The kinetic parameters were determined using both the isoconversional (model free) and the model-fitting methods. For comparison, Advanced Kinetics and Technology Solution (AKTS) software was also used. It was found that the addition of an HTPB-based polyurethane matrix to pure RDX decreased its decomposition temperature. It was also found that RDX/ HTPB has a lower activation energy than pure RDX. The polyurethane matrix had a significant effect on the decomposition mechanism of RDX resulting in different reaction models. It was concluded that the activation energies obtained using the Ozawa, Flynn, and Wall (OFW) and Kissinger-Akahira-Sunose (KAS) methods were very close to the results obtained via the AKTS software lying in the range 218.3-220.2 kJ·mol −1. The VST technique yielded kinetic parameters close to those obtained using TG/DTG. On the other hand, the Ignition Delay Technique yielded different and inconsistent kinetic parameters.

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Section: Introductionmentioning

confidence: 99%

Thermal Behavior and Decomposition Kinetics of RDX and RDX/HTPB Composition Using Various Techniques and Methods

Abd‐Elghany

Elbeih

Saeed

2016

Cent. Eur. J. Energ. Mater.

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“…Furthermore, the polymer binder performs a significant function in enhancing the mechanical properties of explosives. Several polymers have been used in different PBXs and solid propellants during the past decades [19][20][21]. One of the most commonly used polymeric binders is the hydroxyl terminated polybutadiene (HTPB).…”

Section: Introductionmentioning

confidence: 99%

Kinetic Parameters of PBX Based on Cis‐1,3,4,6‐tetranitroocta‐hydroimidazo‐[4,5‐d] imidazole Obtained by Isoconversional Methods using Different Thermal Analysis Techniques

Elbeih

Abd‐Elghany

Klapötke

2017

Propellants Explo Pyrotec

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The thermal decomposition kinetics of the interesting polycyclic nitramine cis-1, 3,4,6-tetranitrooctahydroimidazo-[4,5-d]imidazole (BCHMX) and its polymer bonded explosive (PBX) based on polyurethane matrix, have been investigated using different thermal analysis techniques and methods. The used polyurethane matrix is based on hydroxyl-terminated polybutadiene (HTPB) cured by hexamethylene diisocyanate (HMDI). Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were used nonisothermally, whereas the vacuum stability test (VST) was used isothermally. Kinetic parameters were determined by using isoconversional (model-free) methods. Furthermore, the Advanced Kinetics and Technology Sol-ution (AKTS) software was used to determine the kinetic parameters of the studied samples in order to provide a comparison. It was found that the decomposition temperature of BCHMX/HTPB is lower than that of pure BCHMX. All the applied techniques as well as computational results showed that BCHMX/HTPB has a lower activation energy than pure BCHMX. The different methods used, Kissinger, Ozawa, Flynn, and Wall (OFW) and Kissinger-Akahira-Sunose (KAS) methods presented activation energies in the same range of the AKTS software results. Also the results proved that VST technique could be a useful tool to present results suitable for calculation of the kinetic parameters of explosives.

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“…Thermosetting propellant (such as hydroxyl-terminated polybutadiene-based propellants) has to be cast within a short span of time after the addition of the curing agent and disposal of a cured propellant via burning in open air, which leads to many environmental problems. 1,2 In view of the inherent disadvantages of cross-linked polymers and energy, a profound interest has emerged concerning the development of energetic thermoplastic elastomers (ETPEs) as a suitable candidate for binder applications. 3,4 Hence, a considerable amount of work has been devoted to investigating ETPEs binder and ETPE-based propellant, which show good application prospects for propellant.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the creep resistance of glycidyl azide polyol energetic thermoplastic elastomer-based propellant by nitrocellulose filler and its mechanism

Sun

Sang

Wang

et al. 2017

Journal of Elastomers & Plastics

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To investigate the effects of nitrocellulose (NC) content on the creep properties of glycidyl azide polyol energetic thermoplastic elastomer (GAP-ETPE)-based propellant, creep behaviour was studied by rotary rheometer under various shear stress and temperatures. Experimental results showed that creep strain and creep rate of samples increase with the increasing shear stress level, and similar creep behaviour tendency was observed under elevated temperature. When filled with 1 and 2 wt% NC, the creep strain and creep rate of GAP-ETPE/NC-based propellant were significantly less than the unfilled state, indicating that the NC contents partly inhibited the mobility of the binder segment and improved the creep resistance of GAP-ETPE-based propellant. Moreover, the constitutive equations of the creep curves were obtained from the four-element mechanical model, and the fitting results coincided well with the experimental data. Among the fitting parameters, the elastic modulus of high elastic deformation, E 2 , and the viscosity of Voigt units, Z 2 , were sensitive and promising for the evaluation of creep strain of the GAP-ETPE-based propellant. Finally, the creep resistance model was established and verified by Fourier transform infrared spectroscopy, glass temperature and physical crossing point density of GAP-ETPE/NC-based propellant. Upon analysis of the experimental data, we concluded that the creep resistance mechanism of GAP-ETPE/ NC-based propellant came from NC altering the flow lines of the continuous phase and restricted chain mobility in the propellant, which improved the creep resistance.

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Studies on a Novel Thermoplastic Polyurethane as a Binder for Extruded Composite Propellants

Cited by 22 publications

References 4 publications

Thermal Behavior and Decomposition Kinetics of RDX and RDX/HTPB Composition Using Various Techniques and Methods

Thermal Behavior and Decomposition Kinetics of RDX and RDX/HTPB Composition Using Various Techniques and Methods

Kinetic Parameters of PBX Based on Cis‐1,3,4,6‐tetranitroocta‐hydroimidazo‐[4,5‐d] imidazole Obtained by Isoconversional Methods using Different Thermal Analysis Techniques

Improvement of the creep resistance of glycidyl azide polyol energetic thermoplastic elastomer-based propellant by nitrocellulose filler and its mechanism

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