Preparation, Characterization of Propargyl Terminal Polybutadiene and Its Crosslinked Elastomers Properties

• Main Authors: Jinxian Zhai, Xiaoyan Guo, Nana Liu
• Format: Article
• Language: English
• Published: MDPI AG 2020-03-01
• Series: Polymers
• Subjects: propargyl terminal polybutadiene; polytriazole polybutadiene elastomers; mechanical properties; thermal stability
• Online Access: https://www.mdpi.com/2073-4360/12/4/748

Propargyl terminal Polybutadiene (PTPB) was successfully prepared through hydroxyl terminal polybutadiene (HTPB) end-capping modification. The FTIR and ¹³C 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⁻¹. In comparison with HTPB, PTPB has a lower viscosity. Using 1,6-diazide hexane as a curing agent, polytriazole crosslinked polybutadiene (PT_riPB) elastomers with various functional molar ratios (<i>R</i>) were prepared by CuAAC reaction, and the glass transition temperatures of the resultant PT_riPB 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_riPB elastomers exhibit a parabolic dependence on <i>R</i>. In addition, the thermal stability of PT_riPB elastomers were also studied. The findings revealed some fundamental features of polytriazole crosslinking elastomer prepared by CuAAC reaction.