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vol.2 número2Evaluation of crystallization kinetics of poly (ether-ketone-ketone) and poly (ether-ether-ketone) by DSCSynthesis of a boron modified phenolic resin índice de autoresíndice de assuntospesquisa de artigos
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Journal of Aerospace Technology and Management

versão impressa ISSN 1984-9648versão On-line ISSN 2175-9146


VILLAR, Luciene Dias et al. The role of antioxidant on propellant binder reactivity during thermal aging. J. Aerosp. Technol. Manag. [online]. 2010, vol.2, n.2, pp.163-168. ISSN 2175-9146.

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Samples of 200 mL were stored in sealed 500-mL Erlenmeyer flasks under atmospheric pressure or vacuum and periodically withdrawn for physical and chemical analysis, infrared spectroscopy characterization and measurement of HTPB/IPDI (isophorone diisocyanate) reactivity, expressed as pot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.

Palavras-chave : Antioxidant; Composite propellant; HTPB propellant; Polyurethane resin; Storage.

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