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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Gu et al. (2003) studied this question.
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