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In polymer melts, the interaction between segments are considered to bescreened and the ideal Gaussian chain statistics is recovered. The experimentalfact that linear viscoelasticity of unentangled polymers can be well describedby the Rouse model is naively considered as due to this screening effect.Although various theoretical models are based on the screening effect and thescreening effect is believed to be reasonable, the screening effect cannot befully justified on a solid theoretical basis. In this work, we study thescreening effect by utilizing a simple dumbbell type model. We performsimulations for dumbbell systems in which particles interact via the Gaussiansoft-core potential. We show that, if the density of dumbbells is high, theGaussian soft-core interaction is actually screened and the static structuresare well described by the ideal model without Gaussian soft-core interaction.We also show that the relaxation moduli of interacting dumbbell systemsapproximately coincide to those of the non-interacting dumbbell systems. In thelow density systems, we observe the deviations from the ideal non-interactingsystems. For example, the relaxation moduli become relatively broad. However,the relaxation moduli of such systems can be decomposed into the relaxationmodes by the Gaussian soft-core interaction and the bond. The bond relaxationmode can be successfully described by a single Maxwell relaxation witheffective relaxation strength and time. Our results support a naive use of theRouse model to analyze unentangled polymer melts.

Linear Viscoelasticity of Dumbbells Interacting via Gaussian Soft-Core Potential