Polyesters with Crankshaft Moieties

An important structural modification which results in a parallel offset within the polymer backbone is the incorporation of 2,6-difunctionalized naphthalene monomers. 

1 Aromatic Main Chain Liquid Crystalline Polymers 

This class of monomers is also referred to as crankshaft monomers. Examples of such monomers are 6-hydroxy-2-naphtho-ic acid (HNA), 2,6-dihydroxynaphthalene (DHN), and 2,6-naphthalene dicarboxylic acid (NDA) (Fig. 9) [14]. 

In particular, the results of the poly (HNA/p-HBA) series are the basis for the commercial development of a family of thermotropic LCPs by the Hoechst Celanese Cor- 

In addition to the 2,6-naphthalene based LCPs, an interesting aromatic LC polyester with 2,6-substituted DBD moieties has been disclosed in several patents [15, 16]. 

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