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H. Tachibana, M. Matsumoto, and Y. Tokura
[Macromolecules , Vol.26, pp.2520-2523,1993]
We have found a simple method for the preparation of oriented films of poly(di-n-hexylsilane) (PDHS). The highly oriented PDHS film can be prepared by rubbing the as-cast film with a wiping paper, by which the Si-backbone chains were oriented along the rubbing direction. The differences in the structure of the PDHS film before and after the rubbing treatment was investigated by measurements of polarized electronic absorption and IR vibrational absorption spectra, AFM images, and X-ray diffraction. In the oriented film of PDHS with a trans-planar conformation, the n-hexyl side chains stand almost perpendicular to the substrate surface. This rubbing method can also be applied to thin films of other polysilanes and polygermanes.