Anewseries of poly(hydrazone–ether)swas synthesized from 3,4-dimethylthieno [2,3-b] thiophene-2,
5-dicarbohydrazide, II and 4,4-diformyl-α, ω-diphenoxyalkanes or 4,4-diformyl -2,2-dimethoxy -α,
ω-diphenoxyalkanes. The inherent viscosities of the polymers were in the range 0.22 – 0.56 dIg−1.
Majority of the polymers were soluble in concentrated H2SO4. Their thermotropic liquid crystalline
properties were examined by DSC, an optical polarizing microscopy using a hot stage and thermogravimetric
analyses. The polymers exhibited almost thermotropic liquid crystalline properties. In
most cases, the mesophases extended up to 430◦C, where thermal decomposition prevented further
observation.