Concentration effects of uncoiling of macromolеcules in the longitudenаl field
The influence of solution concentration on the dynamics and degree of phase transition: non - draining coil - extended chain in the longitudinal hydrodynamics field has been investigated. Analytical expressions of the unusual concentration dependence of fundamental relaxation time τ of flexible - chain macromolecules were obtained. It is also shown that the concentration of solutions profoundly affects the maximum attainable degree of uncoiling of macromolecules: in the concentration range [η]<sub>0</sub>c>1, even at very high gradients, the facto of maximum attainable orientation does not exceed 0.2.