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[摘要]：The organization of a series of phenylene thienylene-based oligomers solubilized with terminal (omega-hydroxyalkyl) and lateral (alkoxy) side chains was studied. The thermal behavior and self-assembly on the surface during solution and thermal processing are mainly affected by the position and length of the side chains. The molecules organize in different fashions, depending on the substitution pattern, as indicated by fiber X-ray scattering results. The oligomer with only lateral side chains behaves as a typical rigid rod arranged in lamella structures, while those with a homogeneous alkyl mantle around the aromatic system adapt a disklike character and form one-dimensional stacks. Because of the large aromatic rod, the role of the terminal hydroxy groups on the self-assembly can be neglected. The choice of the alkyl density around the aromatic core allows a control over the molecular organization, which is essential for the development of high-performance solution-processable organic semiconductors. |
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