Joshua M. Rinehart, Zhuang Xu, Ziming Wang, Anna M. Österholm, Lucas Q. Flagg, Lee J. Richter, Chad R. Snyder, Ying Diao, John R. Reynolds
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Impact of Side-Chain Polarity and Symmetry on the Structure and Properties of Acyclic Dioxythiophene Polymers
Conformationally flexible side-chains on conjugated polymers promote solution processability while significantly impacting solution aggregation, solid-state ordering, and polymer–electrolyte interactions. These side-chains can strongly influence the repeat unit symmetry, polarity, steric bulk, and noncovalent interactions that collectively dictate how polymer chains pack and assemble. Acyclic dioxythiophene polymers (PAcDOTs) are highly redox-active thiophene-based organic mixed ionic-electronic conductors (OMIECs) where both the 3- and 4-positions of the thiophene ring are substituted by alkoxy groups. In this study, we explore the solution and solid-state structures of both symmetric (R1 = R2) and asymmetric (R1 ≠ R2) PAcDOTs, where R1 and R2 are both either nonpolar or amphiphilic, and we observe rich process-structure behavior. The combination of regio-symmetric and amphiphilic side-chains results in a chiral, lyotropic phase in chloroform solutions that persists as a metastable state in thin films. Temperature-dependent grazing incidence X-ray scattering and cross-polarized optical microscopy indicate that PAcDOTs with regio-symmetric linear side-chains can crystallize into highly ordered morphologies upon thermal treatment. Finally, we show that side-chain polarity, symmetry, and thermal annealing affect the electrochemical doping and dedoping processes.
期刊介绍:
The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.