| Summary: | Propargyl terminal Polybutadiene (PTPB) was successfully prepared through hydroxyl terminal polybutadiene (HTPB) end-capping modification. The FTIR and <sup>13</sup>C NMR results indicated that the HTPB terminal hydroxyl was thoroughly replaced and yielded the target product, PTPB, with a theoretical propargyl content of 0.66 mmol g<sup>−1</sup>. In comparison with HTPB, PTPB has a lower viscosity. Using 1,6-diazide hexane as a curing agent, polytriazole crosslinked polybutadiene (PT<sub>ri</sub>PB) elastomers with various functional molar ratios (<i>R</i>) were prepared by CuAAC reaction, and the glass transition temperatures of the resultant PT<sub>ri</sub>PB elastomers were approximately −75 °C, measured by differential scanning calorimetry (DSC), nearly independent of elastomer <i>R</i> values. Mechanical tests indicated, that with the increase in <i>R</i>, the mechanical properties of PT<sub>ri</sub>PB elastomers exhibit a parabolic dependence on <i>R</i>. In addition, the thermal stability of PT<sub>ri</sub>PB elastomers were also studied. The findings revealed some fundamental features of polytriazole crosslinking elastomer prepared by CuAAC reaction.
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