Accelerated Aging Mechanism and Correlation of Hydroxyl-terminated Polybutadiene(HTPB)
The work aims to elucidate the high-temperature accelerated aging research and mechanistic analysis of Hy-droxyl-Terminated Polybutadiene(HTPB)propellant materials,and establish a linkage between microstructural alterations and macroscopic property variations.It systematically examined the microstructural transformations and macroscopic property variations in typical HTPB propellant materials subject to high-temperature aging.The emphasis was placed on investigating the molecular mechanisms and failure modes during accelerated aging,and deducing performance variations through the establish-ment of a correlation between microstructure and macroscopic properties.The findings suggested that the primary cause of macroscopic property variation over time was mainly attributed to microstructural damages,such as oxidation and cross-linking of the matrix as well as the interface damage,with oxidation cross-linking reactions observed not merely on the specimen's sur-face but also internally.Further investigation revealed a significant correlation between mechanical properties—tensile strength,elongation at break—and glass transition temperature(tg),the α-relaxation peak,and gel content.Oxidative damage in both the internal and surface regions of HTPB propellant materials,accompanied by filler-matrix interface damage during the high-temperature accelerated aging process,fundamentally results in the decline of mechanical properties.
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