Download Alignment Technologies and Applications of Liquid Crystals by Kohki Takatoh, Masanori Sakamoto, Ray Hasegawa, Mitsushiro PDF

By Kohki Takatoh, Masanori Sakamoto, Ray Hasegawa, Mitsushiro Koden, Nobuyuki Itoh, Masaki Hasegawa

ISBN-10: 0748409025

ISBN-13: 9780748409020

Written by means of a bunch of authors, who've released commonly within the foreign examine literature, the publication takes a close examine a severe element of Liquid Crystal know-how - the alignment features and houses of the fabrics utilized in the development and use of LCDs. The ebook examines the chemical, actual and mechanical houses of the fabrics and relates them to functional functionality concerns within the smooth Liquid Crystal. This authoritative sourcebook can be of serious price for all enthusiastic about the sensible and theoretical problems with alignment phenomena in Liquid Crystals.

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Extra resources for Alignment Technologies and Applications of Liquid Crystals

Sample text

A larger tilt angle for the main chain was generated by a side chain that gets into the bulk below the surface. Opinions on the mechanism of the pretilt angle of the LC in the case of polyimide with side chains are divided. One view is that it is directly caused by the side chains and another view is that it is caused by the main chains as shown in Fig. 26. An increase in the tilt angle of the main chain with increase in the side chain length was also observed as shown in Fig. 27 [41, 59]. From the results of water contact angle measurements, the side chains are oriented inward.

From these results, it can be considered likely that the pretilt angle of the LC is caused by the tilt angle of the polymer main chains. Asymmetrical distribution of the polymer main chain between the parallel and antiparallel direction relative to rubbing was confirmed by the asymmetric absorption of the SHG and the IR spectrum. In the case of the main chain type polymers, the rubbing stress causes an asymmetric zigzag structure of the main chains. In the case of side chain type polymers, the tilt angle of the main chain increases with the length of the side chain.

A smooth surface was assumed. Reproduction by permission from [62]. The buffing length of a single fibre l can be expressed by the rubbing pressure M, and the cylinder diameter r as, l% p 2rM: ð2:7Þ From this equation, the ratio of the area, affected by rubbing, Af is proportional to wfl and increases with increase in rubbing pressure, and wf l / Af % FðMÞM 1=2 : ð2:8Þ Here, F(M) is the rubbing stress related to the rubbing pressure. Increasing the number of rubbings increases Af, the ratio of the area affected by rubbing, but it © 2005 Kohki Takatoh, Masaki Hasegawa, Mitsuhiro Koden, Nobuyuki Itoh, Ray Hasegawa and Masanori Sakamoto 30 Masaki Hasegawa becomes saturated when all of the area has been affected by rubbing.

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