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- W2023500541 abstract "The morphology of a conjugated polymer thin film determines how it will behave as an active layer in optoelectronic devices. The liquid crystalline phase present in some conjugated polymers offers a unique way of controlling the film morphology. For example, films in which the chains are aligned in a single direction can be fabricated by processing films on a templating layer and annealing them above the liquid crystalline melting point of the polymer. However, the ability to align to a templating layer will be influenced by the character of the as-cast film. This effect was examined by casting poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) films from a range of both aromatic and chlorinated solvents on top of rubbed polyimide layers and aligning via the thermotropic melt. Measurements of the dichroic ratio as a function of annealing time revealed that films cast from high boiling point aromatic solvents like isodurene (ISO) and o-xylene (OXY) aligned well with a maximum dichroic ratio over 10. Films cast from toluene (TOL), a lower boiling aromatic solvent, exhibited a lower Dmax of only around 5, while the films cast from chloroform (CHL) and tetrachloroethane (TCE), both chlorinated solvents, exhibited very low dichroic ratios. The best alignment (Dmax = 15) was achieved when a F8BT film was annealed while still “wet”, which proves that a plasticizer (in this case ISO molecules) can improve the mobility of the polymer chains as they initially align to the rubbed surface. However, it is unclear whether a plasticizing effect (from residual solvent) is responsible for the differences in the alignment observed in films that were dried before annealing, as Dmax for these samples did not directly correlate to the volatility of the solvent. Ellipsometric measurements showed that all the films that aligned well exhibited a much more dramatic densification upon annealing than those that did not align well. Since all the well-aligned films were cast from aromatic solvents, we believe that aromatic interactions between polymer and solvent is critical in spinning a film that will align well. These results will guide future efforts into improving molecular orientation of liquid crystalline polyfluorene films." @default.
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- W2023500541 date "2004-07-17" @default.
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- W2023500541 title "Influence of the Casting Solvent on the Thermotropic Alignment of Thin Liquid Crystalline Polyfluorene Copolymer Films" @default.
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- W2023500541 doi "https://doi.org/10.1021/ma035775h" @default.
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