Molecular dynamics (MD) simulations of a polyethylene melt were performed to investigate the validity of the Rouse model predictions for a comprehensive set of correlation functions. It was found that the chains behave like Rouse theory predicts, but only on length scales larger than the segment length.
Padding, J. T., & Briels, W. J. (2001). Zero-shear stress relaxation and long time dynamics of a linear polyethylene melt: A test of Rouse theory. Journal of Chemical Physics, 114(19), 8685-8693. https://doi.org/10.1063/1.1368135