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Molecular Orientation in Polymer-Dispersed Liquid Crystals Using Time-Resolved FT-IR

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Molecular orientation of nematic microdroplets in polymer-dispersed liquid crystal (PDLC) films has been investigated by time-resolved FT-IR (TR/FT-IR) in the presence of an applied electric field. Two kinds (fast and slow) of reorientation processes are found, and these may be attributed to reorientation of liquid crystal molecules at the surface and the central region of droplets. In addition, an induction time has been observed before the onset of the actual reorientation. It is suggested that there are no essential differences between rigid and flexible molecular segments with respect to reorientation dynamics of at least 1 ms time resolution. TR and micro-FT-IR techniques have been combined in order to study the reorientation dynamics of the different regions of droplets.

Keywords: Molecular orientation; Polymer-dispersed liquid crystals; Time-resolved FT-IR; Time-resolved/micro-FT-IR

Document Type: Invited Paper


Affiliations: 1: Materials and Electronic Devices Laboratory, Mitsubishi Electric Corporation, 1-1, Tsukaguchi-Honmachi 8-Chome, Amagasaki, Hyogo 661, Japan 2: Nippon Bio-Rad Laboratories, 3-6, Kachidoki 5-Chome, Chuo-Ku, Tokyo 104, Japan

Publication date: September 1, 1993

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