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Anisotropic shear relaxation is an interesting but rarely discussed issue inpolymer dynamics under confinement [Abberton et al., Macromolecules, 48, 7631,2015]. According to the earlier study of bead spring simulations for anunentangled polymer melt confined between two flat plates, the shear relaxationmodulus taken perpendicular to the interface is accelerated by decreasing thedistance between plates, whereas the parallel component is unchanged. Thisstudy observed similar anisotropic shear relaxation for entangled polymer meltsunder confinement in multi-chain slip-link simulations (primitive chain networksimulations). The analysis demonstrated that the accelerated relaxation in theperpendicular component reflects the Rouse-type constraint release dynamics,for which the coarsening is upper-limited by the geometry. This result suggestsa novel mechanism for anisotropic shear relaxation different from the modifiedchain statistics under confinement considered for unentangled systems.

Anisotropy of shear relaxation in primitive chain network simulations for entangled polymers confined between flat walls