共混GAP基含能热塑性弹性体的 氢键行为与力学性能

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 1.5 MPa at 50 °C, and the elongation was not less than 300% at - 40 °C. 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 1.4 MPa, indicating that the energetic thermoplastic elastomers can be obtained with more balanced performance by blending.