Reactive mesogen

Preparation of a photovoltaic cell comprising an interconnecting liquid crystalline polymer network of reactive mesogens... 

TABLE 1. Physical Properties of Interconnecting Liquid Crystalline Polymer Networks of Reactive Mesogens ... 

Crosslinkable reactive mesogens, (VI), were prepared by O Neill et al. (3) for use in electroluminescent devices. Crosslinking occurred by cyclopolymerization as illustrated in Eq. (1). 

Figure 1 Photochemically reactive mesogenic groups ( mesogens ).

More sophisticated optical compensation layers can be produced as anisotropic networks from reactive mesogens (liquid crystals) in a macroscopically... 

The order must then be frozen in before crystallisation occurs, since this would result in the formation of grain boundaries and a reduction in transport or emission efficiency. Device breakdown is also a possibility. The most efficient way to fix the liquid crystalline order is the formation of anisotropic networks by the polymerisation of reactive mesogens in the liquid crystalline state.Anisotropic polymer networks formed from the thermal or photoinitiated polymerisation of polymerisable, so-called photoreactive, liquid crystalline monomers have been used in a wide variety of electrooptic applications, see Chapter This is a more attractive approach than cross-linking... 

The Reactive Mesogen Technology Applied for Uniaxial and Biaxied Optical Fetarders... 

The literature contains many examples for dense networks prepared from reactive mesogens, which mostly have a rod-like... 

Charge Transport in Reactive Mesogens and Liquid Crystal Polymer Networks... 

Fig. 5.1 Schematic of a calamitic reactive mesogen for charge transport...

Researchers at the University of Hull undertook comparisons between model liquid crystalline compounds and related reactive mesogens, which form nematic mesophases using two different conjugated cores containing the fluorene moiety, see Chaps. 7 and 8. In one study, based on a biphenyl-bithiophene-fluorene(compound HI), core time of flight measurements were carried out in the nematic phase of the model compound, the nematic phase of the diene substituted RM and on the crosslinked compound at room temperature [34], They found a large drop in hole mobility between the model compound and the nematic phase of the RM from 8 X 10 " to 1.5 X 10 cm s There was a small recovery in hole mobility... 

Kreouzis, T., et til. High mobility ambipolar charge transport in a cross-linked reactive mesogen at room temperature. Appl. Phys. Lett. 87(17), 172110 (2005)... 

---