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| - Photoalignment of Poly(di-n-hexylsilane) by Azobenzene Monolayer. 1.Preparative Conditions of Poly(di-n-hexylsilane) Spincast Film
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| - The photocontrol of the in-plane alignment of spincast poly(di-n-hexylsilane) (PDHS) filmwas successfully achieved on a photooriented azobenzene- (Az-) containing monolayer irradiated withlinearly polarized visible light. The Si backbone of PDHS after crystallization aligned in the perpendiculardirection to the polarization plane of actinic light. The preparative conditions of the PDHS film such asmolecular weight of this material and thickness were examined in detail by polarized UV−visibleabsorption spectroscopy. The orientational order of PDHS chain was strongly dependent on the molecularweight of PDHS. Lowering of the molecular weight of PDHS gave rise to a higher orientational order ofthe Si backbone. With increasing film thickness, the photoalignment of the PDHS main chain becameless efficient. However, successive annealing and crystallization upon cooling provided high degrees ofalignment even for thicker films of the low molecular weight material. The atomic force microscopicobservation revealed the formation of characteristic fibrous morphologies in the film, which was directedparallel to the electric vector of the polarization. Thus, photoinduced anisotropy in the Az monolayercontrols not only the PDHS backbone alignment but also the mesoscale morphology of the film at largerhierarchies.
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