Rheo-Dielectrics and Diffusion of Type-A Rouse Chain under Fast Shear Flow: Method of Evaluation of Non-Equilibrium Parameters for FENE, Friction-Reduction, and Brownian Force Intensity Variation

Rouse model is the basic molecular for unentangled linear polymer chains in melts. Recent studies suggest that parameters characterizing melts, spring strength κ , segmental friction coefficient ζ, and mean-square Brownian force intensity B, change under fast flow thereby providing significant rheological nonlinearities with those melts (Matsumiya et al., Macromolecules, 51, 9710 (2018)). This article theoretically analyzes effects of flow-induced changes these on dielectric diffusion behavior chain having so-called type-A dipoles parallel along backbone. It turned out steady shear determined by non-equilibrium parameters, rκ = κ/κeq rζ,ij ζij/ζeq but irrelevant to rB,ij B ij/Beq, where subscript “eq” stands quantities at equilibrium subscripts “ij” denote spatial direction flow: i and/or j x, y, z velocity, velocity gradient, vorticity directions, respectively. Specifically, complex permittivity ε* analytically expressed terms rζ,ij, which turn enables us evaluate from data relaxation time (obtained future experiments). In contrast, advective rκ. The displacement ‹Δr2CM› center mass defined respect known non-diffusive advection point rB,ij, allowing dielectrically rζ,ij. method experimental evaluation presented this provides a complementary basis analyzing nonlinear