A new theory of the internal viscosity in polymer chains is proposed. Although some of the conclusions are in agreement with the Kuhnhyphen;Cerfhyphen;Peterlin theories, the present approach is based on more rigorous statisticalhyphen;mechanical grounds. However, the theory is unable to predict the exact value of the effective Arrhenius factor (A) related to thegaucherlarr2;transtransitions between rotational states on the chain bonds. The internal viscosity force turns out to be a nonlinear effect of the chain motion. Confining our attention to the linear component, and assuming an oscillatory applied force, the diffusion equation is obtained as a modification of the corresponding equation formerly proposed by Zimm. For infinitely long chains the eigenvalue problem is exactly solved and, with reference to the freehyphen;draining model, the dynamic intrinsic viscosity of a polymer solution as well as the tensile and dielectric relaxation effects are calculated.
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