Tangled Structure Research Articles

Elastic behavior of concentrated solutions of acrylonitrile copolymers. II. The shear‐stress dependence of the shear modulus of a pseudo network in concentrated solutions

AbstractThe shear‐stress dependence of the shear modulus in concentrated solutions of acrylonitrile copolymer was investigated by the capillary end‐correction method. The shear modulus decreases with an increase of shear stress above a critical polymer concentration at ti higher shear rate than that at which the decrease of the viscosity begins to occur. The non‐Hookian behavior of the concentrated solutions may be considered to arise from the breakdown of the tangled network structure, namely elastically deformable pseudo network.