Dynamics of stiff‐chain polymers in multicomponent solutions: Modification of the hole theory

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<jats:title>Abstract</jats:title><jats:p>The previous theory of the global motion dynamics of stiff‐chain polymers in multicomponent systems has been modified by a refined treatment of the jamming effect on the longitudinal diffusion of polymer chains along their end‐to‐end axis to derive a new equation for zero‐shear viscosity, which depends on the longitudinal diffusion coefficients through the lifetimes of entanglements between similar as well as dissimilar polymers. Along with this theoretical study, experimental data forzero‐shearviscosity of quasi‐ternary solutions containing two stiff‐chain polymers with different lengths were obtained. They were well described by the viscosity equation obtained, with only the similarity ratio(s) inherent to the respective polymer‐solvent system(s) as adjustable parameter(s).</jats:p>

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