火炸药学报2017，Vol.40Issue(2)：69-74,6.DOI:10.14077/j.issn.1007-7812.2017.02.013
浇注PBX炸药老化过程中交联密度与力学性能的关系
Relationship between Crosslink Density and Mechanical Properties in the AgingProcess of Casting Polymer Bonded Explosive
摘要
Abstract
In order to disclose the relationship between the crosslink density and the mechanical properties,casting polymer bonded explosive (PBX) samples were aged at 70℃.The characterization methods of crosslink density by equilibrium swelling and nuclear magnetic resonance (NMR) were compared and analyzed.The relationship between different mechanical properties at room temperature,including maximum tensile strength (σm),compressive strength (σb),compression ratio (εb),shear strength (τ) and hardness(SH),and the binder matrix structural crosslinking parameters,including gel fraction (G)and crosslink density (ve) were studied.The variation trend of loss factor and viscoelastic modulus at various aging time were analyzed by dynamic thermomechanical analysis (DMA).The results show that crosslink density increases at the beginning of aging,decreases in the middle of aging and then increases at the last stage of aging again.NMR is regarded as a promising characterization method of the crosslink density for casting PBX due to its simple,fast,high-precision and nondestructive nature.During the aging process,linear relationship between different mechanical properties and crosslink density is evaluated for casting PBX,and the decreasing of mechanical loss is caused by increasing of binder matrix G and ve.Moreover,the degradations and crosslinking are caused by changing of the structures of binder matrix.关键词
物理化学/浇注PBX炸药/交联密度/力学性能/DMA法Key words
physical chemistry/casting PBX/crosslink density/mechanical properties/DMA method分类
军事科技引用本文复制引用
王芳芳,常海,张林军,王琼..浇注PBX炸药老化过程中交联密度与力学性能的关系[J].火炸药学报,2017,40(2):69-74,6.基金项目
国防重大基础科研项目(No.004040204) （No.004040204）
