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• W4386827273 abstract "The ability to control the polymorph in conjugated polymers offers a robust means of scrutinizing the structure–property correlation as various polymorphs with a slight difference in crystal packing greatly impact their solid-state properties. Notably, despite a few studies on the polymorphs of conjugated homopolymers, polymorph control in conjugated polymer blends has yet to be explored. Herein, we report, for the first time, the tailoring of polymorphs (i.e., polymorphs I and II) in a set of poly(3-butylthiophene)/poly(3-hexylselenophene) (P3BT/P3HS) blends with various molecular weights (MWs) via a simple yet efficient meniscus-assisted solution-shearing (MASS) approach. The MASS process renders appealing polymorph transformation of the respective conjugated polymer as well as cocrystallization of either P3BT and P3HS or their phase separation, resulting in different optical properties for each blend. Specifically, P3BT-3K/P3HS-3K, P3BT-3K/P3HS-16K, and P3BT-16K/P3HS-16K blends display a phase-separated structure containing the respective P3BT and P3HS crystals in the drop-cast film, where P3BT-3K and P3BT-16K have polymorphs II and I, respectively, and P3HS-3K and P3HS-16K possess polymorphs II and I, respectively, with minor polymorph II in P3HS-16K as well. This contrasts with the cocrystallization formed in the drop-cast P3BT-16K/P3HS-3K film. Intriguingly, when subjecting the P3BT/P3HS blend solutions to the MASS, the polymorph of P3BT-3K in both P3BT-3K/P3HS-3K and P3BT-3K/P3HS-16K blends transform from polymorph II to I, and cocrystallizes with P3HS-3K in the P3BT-3K/P3HS-3K yet phase-separates with P3HS-16K in the P3BT-3K/P3HS-16K. Increasing MW in the P3BT-16K/P3HS-16K blend confers it to cocrystallize more readily than the low-MW P3BT-3K/P3HS-3K blend due to the more matchable crystal size in the former blend. The polymorph transformation kinetics and associated morphology evolution are scrutinized. These P3BT/P3HS blends with different crystalline structures are found to correlate closely to their optical properties. This work elucidates how P3BT and P3HS experience the polymorph transformation and interact with each other to cocrystallize or phase-separate imparted by a facile MASS process, thereby strengthening the fundamental understanding of polymorph transformation and crystallization behavior in conjugated polymer blends." @default.
• W4386827273 created "2023-09-19" @default.
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• W4386827273 date "2023-09-18" @default.
• W4386827273 modified "2023-10-16" @default.
• W4386827273 title "Tailoring Polymorph, Cocrystallization, and Phase Separation in Conjugated Polymer Blends via Meniscus-Assisted Solution Shearing" @default.
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• W4386827273 doi "https://doi.org/10.1021/acs.macromol.3c01614" @default.
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