ArticleMacromolecular rapid communications2026
Crystalline Structural Evolution in Polythiophene-Based Conjugated Polymer Blends During Rubbing.
Article in Macromolecular rapid communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The ability to tailor the multilevel crystalline structures of conjugated polymers is highly desirable to establish the structure-property relationship. However, investigations into conjugated polymer blends are somewhat limited. Herein, we report crystalline structural evolution in a series of poly(3-alkylthiophene) (P3AT)-based P3AT/P3AT blends containing various alkyl side chains by mechanical rubbing, including cocrystalline and phase-separated structures, crystal orientations (i.e., edge-on and face-on), and large-scale anisotropic crystalline structures. The as-cast poly(3-hexylthiophene)/poly(3-octylthiophene) (P3HT/P3OT) and P3HT/poly(3-dodecylthiophene) (P3HT/P3DDT) blended films show phase-separated structures. Upon rubbing at increased temperatures, the P3HT/P3OT blend transforms into cocrystals at 60°C and 120°C, while P3HT/P3DDT blend becomes partially cocrystal at 60°C and changes back to phase-separated structures at 120°C. Simultaneously, both P3HT/P3OT and P3HT/P3DDT blends transition from the edge-on orientation in the as-cast state to mixed edge-on and face-on orientations after rubbing at 60°C, and then back to the edge-on orientation after rubbing at 120°C. On a larger scale, both blends become anisotropically aligned crystalline films along the rubbing direction. Formation mechanisms of these multilevel crystalline structures in P3AT/P3AT blends are elucidated.
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