共混GAP基含能热塑性弹性体的氢键行为与力学性能

Hydrogen Bond Behavior and Mechanical Properties of Blended GAP Based Energetic Thermoplastic Elastomers

为了改善GAP热塑性弹性体的力学性能,采用了DSC、低场核磁测试、静态力学测试和动态力学测试的方法对两种异氰酸酯固化的弹性体共混体系的氢键行为和力学性能进行分析,建立微观结构与宏观性能的关系。结果表明,由于分子结构原因,HMDI固化的GAP热塑性弹性体和IPDI固化的弹性体显示出不同的氢键行为和力学性能,通过物理共混得到了兼具抗拉强度及断裂延伸率的弹性体,50℃下抗拉强度高于1.5MPa,-40℃下延伸率不低于300%,相较于纯HMDI固化的弹性体,低温延伸率提升了约150%,IPDI固化的弹性体高温抗拉强度提升了约1.4MPa,说明通过共混可得到性能更为均衡的含能热塑性弹性体。

In order to improve the mechanical properties of glycidyl azide polymer(GAP) thermoplastic elastomers,the hydrogen bond behavior and mechanical properties of two isocyanate cured elastomer blends were analyzed by DSC,low field NMR,static mechanics and dynamic mechanics testing.The relationship between microstructure and macroscopic properties was established.The results showed that the HMDI cured GAP thermoplastic elastomers and the IPDI cured elastomers exhibited different hydrogen bonding behaviors and mechanical properties due to molecular structure.The elastomers with both tensile strength and fracture elongation were obtained by physical blending.The tensile strength was higher than 1.5MPa at 50℃,and the elongation was not less than 300% at-40℃.Compared with the pure HMDI cured elastomers,the low-temperature elongation is increased by about 150%,and the high-temperature tensile strength of the IPDI cured elastomers is increased by about 1.4MPa,indicating that the energetic thermoplastic elastomers can be obtained with more balanced performance by blending.