A study of the molecular characteristics of an o-hydroxysubstituted aromatic polyamide*

The hydrodynamic characteristics of an aromatic polyamide based on 3,3′-dihydroxy-4,4′-diaminodiphenylmethane and isophthalyl chloride were studied by viscometric and sedimentation rate methods. The constants for equations relating intrinsic viscosity and sedimentation constant with MM were determined. The unperturbed dimensions of macromolecules, separation between chain ends with free rotation around valence bonds, the Kuhn segment and the equilibrium flexibility parameter were determined by known extrapolation methods. This polyamide belongs to the class of flexible polymers.