differential scanning calorimetry (DSC), and atom force microscopy (AFM) confirmed the presence of a star-shaped structure. Wang and coworkers further
extended this methodology to synthesize star-shaped polymers in which a
hyperbranched triphenylamine core was coupled with P3HT [203] or poly
(3,4-ethylenedioxythiophene-didodecyloxybenzene) [204]. Similar reports of
oligothiophenes decorated on dendrimers [205–208] and small organic molecules
[209] have been reported.
The Kiriy group adopted a core-first synthetic approach for the synthesis of
six-armed P3HT [210, 211]. The core was synthesized using the oxidative addition
reaction of hexakis(4-bromophenyl)benzene with Et 2 Ni(bipy). Grafting P3HT
chains on the initiator formed using GRIM gave rise to the six-armed P3HT with
M n of 8,000 kg/mol and PDI of 1.98. The presence of a hexaphenylbenzene
core was confirmed by
1 H NMR analysis, and the surface morphology observed
by AFM imaging was used to ascertain the star-shaped structure (Fig. 9).
Fig. 9 Structures of the multiarmed P3HTs synthesized: six-armed star (top left), four-armed
star (top right), two-armed V-shape (bottom left), and three-armed Y-shape (bottom right)
[202, 210–213]
Progress in the Synthesis of Poly(3-hexylthiophene)
25
extended this methodology to synthesize star-shaped polymers in which a
hyperbranched triphenylamine core was coupled with P3HT [203] or poly
(3,4-ethylenedioxythiophene-didodecyloxybenzene) [204]. Similar reports of
oligothiophenes decorated on dendrimers [205–208] and small organic molecules
[209] have been reported.
The Kiriy group adopted a core-first synthetic approach for the synthesis of
six-armed P3HT [210, 211]. The core was synthesized using the oxidative addition
reaction of hexakis(4-bromophenyl)benzene with Et 2 Ni(bipy). Grafting P3HT
chains on the initiator formed using GRIM gave rise to the six-armed P3HT with
M n of 8,000 kg/mol and PDI of 1.98. The presence of a hexaphenylbenzene
core was confirmed by
1 H NMR analysis, and the surface morphology observed
by AFM imaging was used to ascertain the star-shaped structure (Fig. 9).
Fig. 9 Structures of the multiarmed P3HTs synthesized: six-armed star (top left), four-armed
star (top right), two-armed V-shape (bottom left), and three-armed Y-shape (bottom right)
[202, 210–213]
Progress in the Synthesis of Poly(3-hexylthiophene)
25