THE ROLE OF ANTIOXIDANT ON PROPELLANT BINDER REACTIVITY DURING THERMAL AGING. doi: 10.5028/jatm.2010.02027310

Authors

  • Luciene Dias Villar Instituto de Aeronáutica e Espaço São José dos Campos – Brazil
  • Rafael Filadelfo da Silva Universidade de São Paulo Lorena – Brazil
  • Milton Faria Diniz Instituto de Aeronáutica e Espaço São José dos Campos – Brazil
  • Marta Ferreira K. Takahashi Instituto de Aeronáutica e Espaço São José dos Campos – Brazil
  • Luis Claúdio Rezende Instituto de Aeronáutica e Espaço São José dos Campos – Brazil

Keywords:

Antioxidant, Composite propellant, HTPB propellant, Polyurethane resin, Storage.

Abstract

Thermal aging of hydroxy-terminated polybutadiene (HTPB) stabilized with 2,6-di(tert-butyl)hydroxytoluene (BHT) was carried out at 60°C 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Samples of 200 mL were stored in sealed 500-mL Erlenmeyer flasks under atmospheric pressure or vacuum and periodically withdrawn for physical and chemical analysis, infrared spectroscopy characterization and measurement of HTPB/IPDI (isophorone diisocyanate) reactivity, expressed as pot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.

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Published

2011-07-29

Issue

Vol. 2 No. 2 (2010): May./Aug. 2010

Section

Original Papers

License

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