The dynamic deformation of polymeric systems (spinning solutions of polymers) with a polymer concentration above the critical value, characterized by an unstable deformation regime, was investigated. The unified theory of deformation of polymeric systems in a viscoelastic state, by means of which it is possible to undertake a rheological analysis of the viscoelastic characteristics of polymeric systems from two measurement points over a wide range of variation of velocity gradient, was used for the investigation. It was shown that the intersection of the classical loss modulus and elasticity modulus curves is due to transition of the polymeric system to an enforced elastic state with the appearance of an effect from negative complex viscosity and its negative elastic component. Good agreement is observed during comparison of the data of unified deformation theory and experimental data for the stable deformation region.

研究了聚合物浓度高于临界值的聚合物体系（聚合物纺丝溶液）的动态变形，其动态变形特征不稳定。在粘弹性状态下，聚合物体系变形的统一理论可用于从两个测量点在速度梯度的宽范围变化中对聚合物体系的粘弹性特性进行流变分析。调查。结果表明，经典的损耗模量和弹性模量曲线的交点是由于聚合物体系向增强的弹性态过渡，并表现出负复合粘度及其负弹性成分的作用。