Polyanhydrides terephthalic acid

Synthesis of polyanhydrides from the aromatic dicarboxylic acids (isophthalic and terephthalic acids) by melt polycondensation was first... 

Polyanhydrides of terephthalic acid (10.39), isophthalic acid (10.40), and sebacic acid (10.41), were prepared by reaction with phosgene in toluene in the presence of NEtj [1865]. The polymers all have the general structure 10.42 X = l,4-CgH4, 1,3-CgH or (CHj). ... 

The first aromatic polyanhydrides synthesized were poly(isophthalic acid) (IPA) and poly(terephthalic acid) (TA). A few common aromatic polyanhydrides are shown in Table 1. Homopolymers of aromatic diacids... 

Low molecular weight polyanhydrides (4) were obtained by Yoda and Miyakefrom the reaction of terephthalic acid in pyridine with adlpyl and sebacyl chloride in ether or benzene at 25-30 C for four hours. In similar studies poorer yields were obtained when employing aliphatic dlaclds and terephthaloyl chloride. 

Aromatic Polyanhydrides. Aromatic homopolyanhydrides are insoluble in common organic solvents and melt at temperatures above 200°C (29). These properties limit the use of purely aromatic polyanhydrides, since they cannot be fabricated into films or microspheres using solvent or melt techniques. Fully aromatic polymers that are soluble in chlorinated hydrocarbons and melted at temperatures below 100°C were obtained by copolymerization of aromatic diacids such as isophthalic acid (IPA), terephthalic acid (TA), l,3-bis(carboxyphenoxy)propane (CPP), or l,3-bis(carboxyphenoxy)hexane (CPH). 

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