A newly designed ladder-like polysiloxane (LPS) containing dual photoreactive side groups has been synthesized for the purpose of generating high-quality photo-alignment layers with controllable pretilt angle (∼ 1–7°, see Figure and cover). Integrated spectroscopic methods of UV dichroism, surface-enhanced Raman scattering (SERS), and FT-IR are used together for the first time to elucidate the photo-alignment mechanism and the real cause of the high pretilt angle.
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