Synthesis and characterization of stereoregular π-conjugated polyarylenynes, (-Ar-(E)-CH=CHC≡C-)n, decorated with branched bis-alkoxy side chains

•Synthesis of conjugated polymers under mild conditions.•Controlled alkyne polyaddition process with a commercial catalyst.•High trans-stereoselectivity of the arylenyne repeating units.•Side chain alkyl branching and luminescence properties.•Processability and aggregation conditions of PPEV polymers;