The thermotropic polymorphism of poly(azomethine) of general formula: p = 1,3,6, has been studied. The combined use of gel permeation chromatography, light scattering and viscosimetry enable the determination of the molecular weight of the samples and of the coefficients K and a of the Mark-Houwink viscosity law. We showed that, in dilute solution, the chains can be considered as flexible chains with excluded volume effect. By polarized light microscopy, the existence of thermo-tropic liquid-crystalline phases has been shown. The temperature of transition between the phases depends on the length of the aliphatic part. For example, for p = 6, after the crystalline phase, a smectic phase appears at 240°C and a nematic phase at 290°C. The nematic phase was proved by observing the threaded texture.
No takes yet. Share an insight, caveat, or question.
Millaud et al. (1979) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: