Chemistry Reference
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alignment in the cell is high, compared to that on the film treated by 90
°
(
θ
)-
rubbing and subsequent 90
)-exposure (see Figure 13).
As seen in Figure 14, similar polar diagrams were obtained for the LC cells
fabricated with 6F-HAB-ETCOU films that were treated in the same manner as
the 6F-HAB-CI films. However, the LC alignment in the cell apparently varies
only slightly with the sequence of 90
°
(
θ
)-rubbing in the film
treatment process. Further, the degrees of LC alignment in these cells are very
similar to that of the cell fabricated with a polymer film subjected to 0
°
(
θ
)-exposure and 90
°
(
θ
°
(
θ
)-
Figure 13. Polar diagrams of absorbances measured from LC cells fabricated with 6F-HAB-CI
films which were treated by 90
°
(
θ
)-rubbing and 90
°
(
θ
)-exposure: CI-RP, rubbed and subsequently
UV-exposed; CI-PR, UV-exposed and subsequently rubbed. Here,
θ
is defined as the angle between
the longer axis of the glass slide and either the rubbing direction or the electric vector of the linearly
polarized actinic UV light (260-380 nm wavelength). A rubbing density of 130 and an exposure
dose of 1.50 J/cm
2
were employed.
Figure 14. Polar diagrams of absorbances measured from LC cells fabricated with 6F-HAB-
ETCOU films that were treated by 90
°
(
θ
)-rubbing and 90
°
(
θ
)-exposure: CU-RP, rubbed and subse-
quently UV-exposed; CU-PR, UV-exposed and subsequently rubbed. Here,
θ
is defined as the angle
between the longer axis of the glass slide and either the rubbing direction or the electric vector of the
linearly polarized actinic UV light (260-380 nm wavelength). A rubbing density of 130 and an ex-
posure dose of 1.50 J/cm
2
were employed.
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