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Improvement in Solubility and Molecular Assembly of Cyclopentadithiophene–Benzothiadiazole Polymer
Author(s) -
Lee Jungho,
Marszalek Tomasz,
Lee Kyu Cheol,
Kim Jonggi,
Pisula Wojciech,
Yang Changduk
Publication year - 2015
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201500087
Subject(s) - side chain , solubility , polymer , conjugated system , alkyl , polymer chemistry , materials science , chemical engineering , chemistry , organic chemistry , engineering
Using linear side chains for conjugated polymers is hindered by their limited solubility in common organic solvents, creating problems during purification and processing, whereas branched alkyl chains generally preclude interchain interdigitation because their bulkiness usually hinders interchain interactions. To compensate the adverse effects from each side chain, it is shown that replacing commonly employed 2‐ethylhexyl (2EH) solubilizing groups with branched 5‐ethylnonyl (5EN) chains not only improves solution processability to PCDT‐BT polymer, but also induces an advantageous change in polymer self‐assembly and backbone orientation in thin films that correlates with an increase in transistor performance.