Synthesis of Co-polyesters Containing Pyridine Ring in the Main Chain

Abstract

The synthesis and these physical properties, such as the apperaance, the melting point, the solution viscosity, and the melt spinnable property of co-polyesters containing pyridine ring in the main chain, have been studied in detail. Co-polyester of 2, 6-dimethy 1-3, 5-dicarbethoxy pyridine, dimethyl terephthalate, and ethylene glycol were prepared by the melt polymerization. On the other hand, those of pyridine dicarboxylic acid dichloride (isocinchomeronyl chloride or dinicotinyl chloride), aliphatic dicarboxylic acid dichloride (succinyl chloride or adipyl chloride), and bisphenol A were prepared by the interfacial polymerization.
Independently of the molar ratio of the component of the reactants, all of the co-polyesters produced by the melt polymerization were yellow solids, while all of the co-polyesters given by the interfacial polymerization were colorless solids. The co-polyesters having higher melting point, even if they have been produced by the latter method, turned brown in the melting processes.
The eutectic curves for these co-polyesters were prepared with the change of the molar ratio of the acid components in each of all co-polymerizations. Furthermore, the heats and the entropies of the fusion per the repeating unit were established on the basis of the Flory's fusion theory for the random co-polymer.