Aging Mechanisms and Structure-Property Relationships of Hydroxyl-Terminated Polybutadiene Systems under Natural Storage Conditions
Hydroxyl-terminated polybutadiene(HTPB)is used in the solid rocket propellants and is crucial to the power system of national defense equipment.Although there are many research results about the aging mechanisms of HTPB,the exact relationships between its aging mechanisms under natural storage conditions and its performance degradations have not been fully elucidated.This study focused on exploring the aging behaviors of HTPB propellant during natural storage,and was committed to elucidate the intrinsic relationships between microstructural damages and macroscopic performance degradations.By conducting fine microstructure characterizations and macroscopic performance tests on HTPB propellant samples,the study revealed the dynamic relationships between structural changes and performance degradations during the aging process.The results show that with the prolongation of storage time,the attenuation of the macroscopic properties of HTPB propellant is mainly caused by the structural damages at the microscopic level,such as the increase of oxidative cross-linking and the breakage and degradation of molecular chains.In particular,these aging effects are more pronounced in the internal structure of the material.In the early stage of storage,the oxidative cross-linking is the dominant aging mechanism.However,in the later stage,the degradation and fracture become the main aging processes.In-depth analysis finds that there is a significant correlation among the mechanical properties of HTPB propellant(such as tensile strength and elongation at break),the gel content and crosslinking density.These findings are crucial for understanding the aging mechanisms of HTPB propellants and predicting their long-term storage performances.
Change in Propellant PerformanceNatural Storage AgingMicroscopic CharacterizationMechanism ResearchStructure-Function Relationship
万方数据
维普
