Effect of Block Sequence in All-Conjugated Triblock
Copoly(3-alkylthiophene)s on Control of the Crystallization and Field-Effect
Mobility
Posted on 2020-07-06 - 20:32
Despite
recent impressive advances in synthesis of all-conjugated
diblock copolymers via facile quasi-living Grignard metathesis (GRIM)
polymerization, it remains challenging to achieve well-defined all-conjugated
triblock copolymers of interest. Herein, we report the judicious design
and synthesis of a series of all-conjugated triblock copoly(3-alkylthiophene)s
consisting of poly(3-butylthiophene) (P3BT), poly(3-hexylthiophene)
(P3HT), poly(3-octylthiophene) (P3OT), or poly(3-dodecylthiophene)
(P3DDT) in all 12 possible combinations. The effects of block sequences
and the length of alkyl side chains on their cocrystallization and
microphase-separated structures are investigated. Moreover, the correlation
between different crystalline structures and charge mobilities in
organic field-effect transistors (OFETs) is scrutinized. These rationally
synthesized triblock copoly(3-alkylthiophene)s self-assemble into
cocrystals with an edge-on orientation in as-cast and 150 °C-annealed
samples. Remarkably, the combinations with the shortest alkyl side
chains placed as the central block (i.e., P3HT-b-P3BT-b-P3OT, P3HT-b-P3BT-b-P3DDT,
P3OT-b-P3BT-b-P3DDT, and P3OT-b-P3HT-b-P3DDT) exhibit higher film crystallinity
and charge mobilities than the other two combinations where the blocks
with shortest alkyl side chains are located at two terminals. Intriguingly,
upon thermal annealing near the melting temperature of these combinations,
P3BT-b-P3OT-b-P3HT, P3BT-b-P3DDT-b-P3OT, and P3HT-b-P3DDT-b-P3OT can retain their cocrystalline structure
while the other combinations are found to microphase separate. Finally,
the all-conjugated triblock copoly(3-alkylthiophene)s with proper
block sequence demonstrate stable charge mobilities at high temperatures
and good flexibility in OFET devices. Taken together, this study elucidates
that the block sequence is of key importance on control of the crystallization
and charge transport behavior of poly(3-alkylthiophene)-based triblock
copolymers.
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Zhai, Dalong; Zhu, Mingjing; Chen, Shuwen; Yin, Yue; Shang, Xin; Li, Lixin; et al. (2020). Effect of Block Sequence in All-Conjugated Triblock
Copoly(3-alkylthiophene)s on Control of the Crystallization and Field-Effect
Mobility. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.0c00598
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AUTHORS (8)
DZ
Dalong Zhai
MZ
Mingjing Zhu
SC
Shuwen Chen
YY
Yue Yin
XS
Xin Shang
LL
Lixin Li
GZ
Gang Zhou
JP
Juan Peng