of the PA, exhibits liquid crystallinity and stability in air (Moigne et al. 1992; Oh
et al. 1993; Vicentini et al. 1994; Koltzenburg et al. 1998; Choi et al. 2000; Ting et al.
2002; Liu et al. 2009b).
It is well known that polymers with LC moieties spontaneously align to form
multidomains by virtue of the orientation of the LC moieties. Further linear arrangement of these polymers can be achieved by applying an external force, such as shear
stress and electric or magnetic fields, to construct a monodomain structure on a
macroscopic level. The LC polymers in a monodomain structure exhibit excellent
anisotropic properties including electrical conductivity and linearly polarized luminescence (LPL). Figure 1 shows the formation of multidomains, monodomains, and
helical assemblies through spontaneous orientation as well as linear and helical
arrangement of LC conjugated polymers.
It has been reported that mono-LCPA derivatives exhibit excellent macroscopic
alignment under an applied magnetic field. Macroscopic alignment of the main chain
led to both an enhancement of two orders in electrical conductivity and an electrical
anisotropy accompanied by the magnetically forced orientation of the LC side chain.
Developments in the macroscopic alignment and anisotropic electrical conductivity
Fig. 1 Schematic representation of the spontaneous orientation, linear, and helical arrangement of
LC conjugated polymers
12 Liquid Crystalline Conjugated Polymers with Optoelectronic Functions
343
et al. 1993; Vicentini et al. 1994; Koltzenburg et al. 1998; Choi et al. 2000; Ting et al.
2002; Liu et al. 2009b).
It is well known that polymers with LC moieties spontaneously align to form
multidomains by virtue of the orientation of the LC moieties. Further linear arrangement of these polymers can be achieved by applying an external force, such as shear
stress and electric or magnetic fields, to construct a monodomain structure on a
macroscopic level. The LC polymers in a monodomain structure exhibit excellent
anisotropic properties including electrical conductivity and linearly polarized luminescence (LPL). Figure 1 shows the formation of multidomains, monodomains, and
helical assemblies through spontaneous orientation as well as linear and helical
arrangement of LC conjugated polymers.
It has been reported that mono-LCPA derivatives exhibit excellent macroscopic
alignment under an applied magnetic field. Macroscopic alignment of the main chain
led to both an enhancement of two orders in electrical conductivity and an electrical
anisotropy accompanied by the magnetically forced orientation of the LC side chain.
Developments in the macroscopic alignment and anisotropic electrical conductivity
Fig. 1 Schematic representation of the spontaneous orientation, linear, and helical arrangement of
LC conjugated polymers
12 Liquid Crystalline Conjugated Polymers with Optoelectronic Functions
343