We present results of molecular dynamics simulations of an undercooled polymer melt, performed to study the validity of mode-coupling theory ͑MCT͒ for realistic polymer melts in general. The mean square displacements of the chain segments are computed to study the diffusion constant of the Rouse-like motion. It is shown that this diffusion constant follows a power law behavior as a function of the temperature, as predicted by the MCT. In addition, we studied the incoherent part of the intermediate scattering function and show that these functions obey the second scaling law of the MCT. We also calculated the relaxation times of the ␣-relaxation and found that they follow the same power law (␥ϭ2.9) as the diffusion constant. Using ␥, and the relationships given by MCT, we obtain values for a ͑0.27͒ and b ͑0.46͒ and use these exponents to describe the -relaxation regime. We find that the long time part of the -relaxation can be described accurately by the Von Schweidler relaxation over a wide range of wave numbers. In the short time regime of the -relaxation, no critical decay is observed. ͓S1063-651X͑99͒08111-8͔
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.