Hydrodynamic and dynamo-optical properties of the molecules of an aromatic polyester with p and m phenyl cycles in the main chain

Abstract

The hydrodynamic and optical properties of the molecules of an aromatic polyester dissolved in dichloroacetic acid have been explored by the methods of translational diffusion, viscometry and flow birefringence (b.r.). In the chain of the polymer studied one phenyl cycle in the meta position follows every three phenyl cycles in the para position. Mark-Kuhn equations have been obtained linking the intrinsic viscosity and coefficient of translational diffusion with M; [ η] = 2·6 × 10 −3 M Dη 1.1 cm 3·g −1 and D = 5·6 × 10 −5 M Dη −0.70 . cm 2·sec −1. The results of the investigations are interpreted in terms of the theories of hydrodynamic and dynamo-optical properties of worm-like chains. The equilibrium rigidity of the polyester molecules in solution is characterized by the length of the Kuhn statistical segment 120 ± 20 A ̊ . The anisotropy per unit length of chain 5 × 10 −17 cm 2.