Side Chain LC Polyester

The monomers can be chosen the other way, such as diacid chloride and mesogen containing diol. In this case the reaction medium and different catalyst system has to be chosen [49]. 

A polymeric substituent on LC polyester should be appropriate to exhibit similar influence as in the case of lateral substituents. Moreover, a polymeric substituent can act as a chemically bound solvent [50]. The compatibility of the polyester rods and a random coil matrix polymer should be significantly increased if a substituent exhibiting the same chemical structure as the matrix polymer is used. This may also lead to the reinforcement of the mechanical properties of the matrix polymer which is akin to fiber reinforced composites. 

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Another variant of liquid crystalline polyesters are side chain LC polyester. Usually side chain LC polymers are used for functional purposes such as holographic writing, non-linear optics, optical information storage, photo-addressable film, optical switch etc. 

Figure 8.20 Typical reaction scheme of side chain LC polyester crosslinking using diisocyanate.

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