Polymer and Materials Science
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
High-molecular weight aromatic polyhydrazides have been prepared by using isophthalic, terephthalic, isocinchomeronic, dipicolinic, 5-chloroisophthalic, 2,5-dichloroterephthalic, 5-tert-butylisophthalic, phenyl ether-4,4′-dicarboxylic, pyrazine-2,5-dicarboxylic, and thiophene-2,5-dicarboxylic acid as polymer intermediates. The polyhydrazides were prepared from equimolar amounts of diacid chloride and dihydrazide (or hydrazine) in hexamethylphosphoramide at room temperature. By contrast to aliphatic polyhydrazides, aromatic polyhydrazides were soluble in dimethyl sulfoxide and with few exceptions had polymer melt temperatures in the range of 350-400°C. Inherent viscosities ranged from 0.30 to 1.00 (in dimethyl sulfoxide). Tough films and strong fibers of these polymers could be fabricated.
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