Aromatic polyazomethines preparation

Research Focus Simplified method for preparing conjugated aromatic polyazomethine thiophene derivatives. 

Aromatic polyazomethines are apparently still the most interesting thermotropic polymers of classes other Aan aromatic polyesters for fabrication of high-strength fibers [72]. These polymers are prepared by polycondensation of aromatic diamines with dialdehydes ... 

Rotaxane polymers can also be deemed as polyrotaxanes or pseudopolyro-taxanes, because they have the common structural characteristics that is, many macrocycles reside on a polymer chain. However, unlike polyrotaxanes or polypseudorotaxanes, which are synthesized from the slipping of macrocycles into a polymer chain, rotaxane polymers are synthesized from the polymerization of rotaxane (or pseudorotaxane) monomer, and monomer unit on the polymer chain has one macrocycle. Harada [16] reported the preparation of a rotaxane polymer based on the homopolymerization of bithiophene (2T) pseudorotaxane. Bithiophene formed hrst inclusion compound a-CD-2T with a-CD, and then the polymerizations of a-CD-2T in water using EeCls as an oxidative initiator after centrifugation, the resulting powder was washed with water and THE to remove unreacted monomer and the corresponding rotaxane polymer was found as deep purple powder. Earcas et al. [17] developed a novel aromatic polyazomethine polymer with rotaxane architecture by the copolymerization of a diformylcarbazole derivative with a benzenediamine pseudorotaxane in DME. 

The synthesis of thermotropic polyurethanes, polyethers and aromatic polyazomethines has been reported by other researchers, but at present research on MCLCPs of the type described in this section is concentrated in academia and there has as yet been no major industrial exploitation. Block copolymers of polyarylsulphones and ketones " " are currently exciting interest in a number of laboratories. These have been prepared by synthesizing polyaryl sulphones or ketones with phenolic functionality, acetylating the end groups, and treating these functionalized blocks like a diphenol in a conventional LCP polymerization process. 

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