炔丙基二甲基海因改性GAP的合成及应用

Synthesis of PDMH-GAP and Its Application

3-炔丙基-5,5-二甲基海因(PDMH)与聚叠氮缩水甘油醚(GAP)在二甲基甲酰胺(DMF)溶剂中进行反应,反应摩尔比为:PDMH/GAP=6/7,反应在60℃的条件下进行48h反应完全。PDMH上的炔基与GAP上的叠氮基团发生反应,反应产物为GAP-PDMH。对GAP-PDMH进行了傅立叶变换红外光谱和核磁共振氢谱分析,测定了GAP-PDMH的玻璃化转变温度。实验结果表明,PDMH通过1,3-偶极环加成反应生成三唑五元环结构进入到叠氮粘合剂的侧链中。把GAP-PDMH应用到GAP推进剂的配方中,进行了力学性能测试。与空白样相比较,GAP-PDMH的加入使得推进剂的常温抗拉强度提高了210%,达到了0.65MPa;最大延伸率提高了226%,达到了22.24%;断裂延伸率提高了207%,达到了25.87%。

GAP-PDMH was prepared by the chemical reaction between alkyne and azide in DMF,and the molar ratio was 6/7. The reaction temperature was 60 ℃ and reaction time was 48 h. The GAP-PDMH was identified by FT-IR and ^1H NMR, and glass transition temperature of the GAP-PDMH was measured. Results show that PDMH is grafted into the branch of GAP chains by 1,3-dipolar cycloaddition reaction between alkyne and azide. Mechanical properties of composite GAP propellant with GAP-PDMH were tested. Compared with the blank sample, GAP-PDMH can improve the mechanical properties of the composite propellant at room temperature. The maximum tensile strength is increased by 210% （to be 0. 65 MPa） ; the maximum elongation is increased by 226% （ to be 22.24% ） ; the fracture elongation is increased by 207% （to be 25.87% ）.