Linear Viscoelasticity of Dumbbells Interacting via Gaussian Soft-Core Potential

In polymer melts, the interaction between segments are considered to be screened and ideal Gaussian chain statistics is recovered. The experimental fact that linear viscoelasticity of unentangled polymers can well described by Rouse model naively as due this screening effect. Although various theoretical models based on effect believed reasonable, cannot fully justified a solid basis. work, we study utilizing simple dumbbell type model. We perform simulations for systems in which particles interact via soft-core potential. show that, if density dumbbells high, actually static structures without interaction. also relaxation moduli interacting approximately coincide those non-interacting systems. low systems, observe deviations from For example, become relatively broad. However, such decomposed into modes bond. bond mode successfully single Maxwell with effective strength time. Our results support naive use analyze melts.