  Slip-spring models are valuable tools for simulating entangled polymers,
bridging the gap between bead-spring models with excluded volume and network
models with presumed reptation motion. This study focuses on the DPD-SS
(Dissipative Particle Dynamics - Slip-Spring) model, which introduces
slip-springs into the standard DPD polymer model with soft-core interactions.
By systematically adjusting the fugacity of slip-springs, the density of
slip-springs within the system is varied. Simulation results demonstrate the
compatibility of models with different slip-spring densities in terms of
diffusion and linear relaxation modulus when the average number of slip-springs
per chain is the same. The conversion between DPD-SS models concerning length
and time is achieved through Rouse scaling, which utilizes the average number
of DPD beads between consecutive anchoring points of slip-springs.
Additionally, the modulus conversion is accomplished through the plateau
modulus that takes account of fluctuations around entanglement. Notably,
diffusion and relaxation modulus from the DPD-SS model align with those
reported for standard Kremer-Grest and DPD models featuring strong repulsive
interactions.
