The role of antioxidant on propellant binder reactivity during thermal aging

Villar, Luciene Dias; Silva, Rafael Filadelfo da; Diniz, Milton Faria; Takahashi, Marta Ferreira K.; Rezende, Luis Cláudio

doi:10.5028/jatm.2010.02027310

Abstract:

Thermal aging of hydroxy-terminated polybutadiene (HTPB) stabilized with 2,6-di(tert-butyl)hydroxytoluene (BHT) was carried out at 60ºC from 1 to 11 weeks. Samples of 200 mL were stored in sealed 500-mL Erlenmeyer flasks under atmospheric pressure or vacuum and periodically withdrawn for physical and chemical analysis, infrared spectroscopy characterization and measurement of HTPB/IPDI (isophorone diisocyanate) reactivity, expressed as pot life. Mechanical properties of the cured polyurethane, prepared from aged HTPB, were assayed by uniaxial tension tests. Despite the unchanged chemical structure, an increase in HTPB/IPDI binder reactivity was observed, being correlated with BHT depletion measured as color change (yellowing). Aging of HTPB showed no interference on mechanical properties of the cured polyurethane.

Keywords:
Antioxidant; Composite propellant; HTPB propellant; Polyurethane resin; Storage

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REFERENCES

Bangee, O.D. et al, 1995, "Antioxidant-induced yellowing of textiles", Polymer Degradation and Stability, Vol. 50, No 3, pp. 313-317.
Celina, M. et al, 2006, "Correlation of antioxidant depletion and mechanical performance during thermal degradation of an HTPB elastomer", Polymer Degradation and Stability, Vol. 91, No 8, pp. 1870-1879.
Coquillat, M. et al, 2007a, "Thermal oxidation of polybutadiene. Part 1: effect of temperature, oxygen pressure and sample thickness on the thermal oxidation of hydroxyl-terminated polybutadiene", Polymer Degradation and Stability, Vol. 92, No 7, pp. 1326-1333.
Coquillat, M. et al, 2007b, "Thermal oxidation of polybutadiene. Part 2: mechanistic and kinetic schemes for additive-free non-crosslinked polybutadiene", Polymer Degradation and Stability, Vol. 92, No 7, pp. 1334-1342.
Coquillat, M. et al, 2007c, "Thermal oxidation of polybutadiene. Part 3: molar mass changes of additive-free non-crosslinked polybutadiene", Polymer Degradation and Stability, Vol. 92, No 7, pp. 1343-1349.
Désilets, S., Côté, S., 2006, "Chemical bond between stabilizers and HTPB-binders in propellants", Propellants, Explosives, Pyrotechnics, Vol. 25, No 4, pp. 186-190.
Guyader, M. et al, 2006, "Epoxides in thermal oxidation of polybutadiene", Polymer Degradation and Stability, Vol. 91, No 11, pp. 2813-2815.
Hinney, H.R., Murphy, J.R., 1989, "Suppression of reactivity changes in poly BD^® R-45M resin", Proceedings of the 20th International Annual Conference of ICT, Karlsruhe, Germany, pp. 49-(1-11).
Ninan, K.N. et al, 1996, "Thermoanalytical investigations on the effect of atmospheric oxygen on HTPB resin". Propellants, Explosives, Pyrotechnics, Vol. 21, No 4, pp. 199-202.
Pecsok, R.L. et al, 1976, "Fourier transform infrared studies of the mechanism of oxidation of cis-1,4-polybutadiene", Rubber Chemistry and Technology, Vol. 49, No 4, pp. 1010-1018.
Shanina, E.L., Zaikov, G.E., Mukmeneva, N.A., 1996, "Peculiarities of inhibiting the autooxidation of solid polypropylene with 4,4'-bis(2,6-di- tert-butylphenol)", Polymer Degradation and Stability, Vol. 51, No 1, pp. 51-56.
Takahashi, M.F.K., Diniz, M.F., 2002, "Avaliação por espectroscopia no infravermelho da microestrutura de poliuretano baseado em resina polibutadiênica hidroxilada", Eclética Química, Vol. 27, No special, pp. 263-271.
Takahashi, M.F.K. et al, 1996, "Determinação de índices de hidroxila em polibutadienos hidroxilados e de grupos NCO em diisocianatos e pré-polímeros por espectroscopia no infravermelho com transformada de Fourier", Polímeros: Ciência e Tecnologia, Vol. 6, No 4, pp. 45-52.

Publication Dates

Publication in this collection
May-Aug 2010

History

Received
07 June 2010
Accepted
20 June 2010

This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

[1] Bangee, O.D. et al, 1995, "Antioxidant-induced yellowing of textiles", Polymer Degradation and Stability, Vol. 50, No 3, pp. 313-317.

[2] Celina, M. et al, 2006, "Correlation of antioxidant depletion and mechanical performance during thermal degradation of an HTPB elastomer", Polymer Degradation and Stability, Vol. 91, No 8, pp. 1870-1879.

[3] Coquillat, M. et al, 2007a, "Thermal oxidation of polybutadiene. Part 1: effect of temperature, oxygen pressure and sample thickness on the thermal oxidation of hydroxyl-terminated polybutadiene", Polymer Degradation and Stability, Vol. 92, No 7, pp. 1326-1333.

[4] Coquillat, M. et al, 2007b, "Thermal oxidation of polybutadiene. Part 2: mechanistic and kinetic schemes for additive-free non-crosslinked polybutadiene", Polymer Degradation and Stability, Vol. 92, No 7, pp. 1334-1342.

[5] Coquillat, M. et al, 2007c, "Thermal oxidation of polybutadiene. Part 3: molar mass changes of additive-free non-crosslinked polybutadiene", Polymer Degradation and Stability, Vol. 92, No 7, pp. 1343-1349.

[6] Désilets, S., Côté, S., 2006, "Chemical bond between stabilizers and HTPB-binders in propellants", Propellants, Explosives, Pyrotechnics, Vol. 25, No 4, pp. 186-190.

[7] Guyader, M. et al, 2006, "Epoxides in thermal oxidation of polybutadiene", Polymer Degradation and Stability, Vol. 91, No 11, pp. 2813-2815.

[8] Hinney, H.R., Murphy, J.R., 1989, "Suppression of reactivity changes in poly BD^® R-45M resin", Proceedings of the 20th International Annual Conference of ICT, Karlsruhe, Germany, pp. 49-(1-11).

[9] Ninan, K.N. et al, 1996, "Thermoanalytical investigations on the effect of atmospheric oxygen on HTPB resin". Propellants, Explosives, Pyrotechnics, Vol. 21, No 4, pp. 199-202.

[10] Pecsok, R.L. et al, 1976, "Fourier transform infrared studies of the mechanism of oxidation of cis-1,4-polybutadiene", Rubber Chemistry and Technology, Vol. 49, No 4, pp. 1010-1018.

[11] Shanina, E.L., Zaikov, G.E., Mukmeneva, N.A., 1996, "Peculiarities of inhibiting the autooxidation of solid polypropylene with 4,4'-bis(2,6-di- tert-butylphenol)", Polymer Degradation and Stability, Vol. 51, No 1, pp. 51-56.

[12] Takahashi, M.F.K., Diniz, M.F., 2002, "Avaliação por espectroscopia no infravermelho da microestrutura de poliuretano baseado em resina polibutadiênica hidroxilada", Eclética Química, Vol. 27, No special, pp. 263-271.

[13] Takahashi, M.F.K. et al, 1996, "Determinação de índices de hidroxila em polibutadienos hidroxilados e de grupos NCO em diisocianatos e pré-polímeros por espectroscopia no infravermelho com transformada de Fourier", Polímeros: Ciência e Tecnologia, Vol. 6, No 4, pp. 45-52.

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