Predictive relation for the -relaxation time of a coarse-grained polymer melt under steady shear
Jack F. Douglas, Andrea Giuntoli, Francesco Puosi, Dino Leporini, Francis W. Starr
We examine the influence of steady shear on structural relaxation in a model coarse-grained unentagled polymer melt over a wide range of temperature and shear rates. Shear is found to progressively suppress the α-relaxation process observed in the intermediate scattering function, leading ultimately to a purely inertially dominated β-relaxation at high shear rates. The observed trend upon increasing shear is qualitatively similar to increasing temperature, which likewise diminishes the contribution of the α-relaxation to structural relaxation. Parallel trends with increasing shear rate and temperature are also reflected in the variation of the stretching exponent describing structural relaxation.