No abstract

Synthesis of a multiblock copolymer composed of cis‐1,4‐polybutadiene (PBd) segments and poly(3‐buten‐1‐ol) segments is performed via successive hydroboration and oxidation of cis‐1,4/syn‐1,2‐multiblock PBd. The ratio of functionalization can be controlled by changing the amount of the borane reagent. The obtained polymer shows two distinctive glass‐transition temperatures, which correspond to the cis‐1,4‐PBd block and the poly(3‐buten‐1‐ol) block. These thermal properties clearly show that the functionalization of the PBd proceeds keeping the elastic property derived from cis‐1,4 segment.