The isothermal stress relaxation behaviour of polyBH-A is shown in kJ/mol and 165.6 kJ/mol, respectively . Like other metathesis vitrimers, 𝑇 𝑣 of polyBH-A is below its 𝑇 𝑔 of 155°C, meaning a high potential of stress relaxation is frozen in the material when the temperature is below the 𝑇 𝑔 . Upon reaching the glass transition temperature, fast dynamic bond exchange is triggered, enabling reprocessing to be carried out.