自然贮存条件下端羟基聚丁二烯体系的老化机理与结构-性能关系  

Aging Mechanisms and Structure-Property Relationships of Hydroxyl-Terminated Polybutadiene Systems under Natural Storage Conditions

作　　者：曾繁琦 陈家兴 杨其[1] 吕亚栋[1] ZENG Fanqi;CHEN Jiaxing;YANG Qi;LYU Yadong(School of Polymer Science and Engineering,Sichuan University,Chengdu 610065,China;Inner Mongolia Power Machinery Research Institute,Hohhot 010000,China)

机构地区：[1]四川大学高分子科学与工程学院,四川成都610065 [2]内蒙动力机械研究所,内蒙古呼和浩特010000

出　　处：《塑料工业》2024年第7期144-149,共6页China Plastics Industry

基　　金：国家自然科学基金(U23A20588)。

摘　　要：端羟基聚丁二烯(HTPB)应用于固体火箭推进剂,对国防装备的动力系统至关重要。虽然围绕HTPB老化机理的研究成果众多,但其在自然贮存条件下的老化机制及与性能劣化之间的确切关系尚未充分阐明。本研究专注于探索HTPB推进剂在自然贮存期间的老化行为,致力于阐释微观结构损伤与宏观性能衰减之间的内在联系。研究通过对HTPB推进剂样品进行精细的微观结构表征与宏观性能测试,揭示了老化过程中结构变化与性能劣化的动态关系。结果显示,随着贮存时间的延长,HTPB推进剂宏观性能的衰减主要源于微观层面的结构损伤,如氧化交联增加与分子链的断裂降解。特别地,这些老化效应在材料的内部结构中更为显著。在贮存的早期阶段,氧化交联是主导老化机制;而在后期,降解断裂则成为主要老化过程。深入分析发现,HTPB推进剂的力学性能(如拉伸强度和断裂伸长率)与其凝胶含量及交联密度之间存在显著的相关性。这些发现对于理解HTPB推进剂的老化机理和预测其长期贮存性能具有重要意义。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.

关 键 词：推进剂性能变化 自然贮存老化 微细观表征 机理研究 构效关系 

分 类 号：TQ317.6[化学工程—高聚物工业]