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Synthesis and Characterization of a Crystalline Triblock Copolymer Containing a Conjugated Rod Segment

A crystalline conjugated block copolymer(PLA-b-PF-b-PLA) of poly(9,9′-didodecylfluorene) (PF) and poly(L-lactide) (PLA) was synthesized by a ring opening polymerization method. The oligofluorene with hydroxyl ends was prepared by the Yamamoto-type coupling of 2,7-dibromo-9,9-didodecyl-fluorene using a Ni(COD)2 catalyst as reductive transition metal-base coupling agent. The molecular structure of PLA-b-PF-b-PLA was characterized by 1H-NMR, GPC, DSC and PL techniques. The photoluminescence of PLA-b-PF-b-PLA was highly influenced by the crystalline PLA blocks.