All-conjugated triblock polyfluorenes with well-defined molecular weights and low polydispersities
are synthesized via chain-growth Suzuki-Miyaura polymerization.
Ionization of pendant alkylbromide chains by pyridine affords
amphiphilic triblock polyelectrolytes with neutral/charged/neutral or
charged/neutral/charged segments. The immiscible blocks lead to
aggregation in polar and nonpolar solvents, and to complex surface
morphologies depending on the polarity of the substrate. These triblock
polyelectrolytes can also be used as interfacial layers in polymer
light-emitting diodes to facilitate electron injection from aluminum.