Chain Relaxation Time in ABS Polymer Melts.

Stress relaxation in entangled polymer melts.

We present an extensive set of simulation results for the stress relaxation in equilibrium and step-strained bead-spring polymer melts. The data allow us to explore the chain dynamics and the shear relaxation modulus, G(t), into the plateau regime for chains with Z=40 entanglements and into the terminal relaxation regime for Z=10. Using the known (Rouse) mobility of unentangled chains and the m...

Single chain diffusion process and proton magnetic relaxation in polymer melts

2014 The present work aims at connecting properties of the quantum coherence of proton magnetic moments linked to strongly entangled polymer chains to low frequency dynamical properties of polymeric liquids. Theoretical and experimental results giving evidence for the presence of a residual tensorial spin coupling induced by chain confinement or crosslinks are commented by using a freely jointe...

Syddansk Universitet Stress Relaxation in Entangled Polymer Melts

Induced orientational effects in relaxation of polymer melts.

We study stress relaxation in bidisperse entangled polymer solutions. Shorter chains embedded in a majority of longer ones are known to be oriented by coupling to them. We analyze the mechanism for this both by computer simulation and theoretically. We show that the results can be understood in terms of stress fluctuations in a polymer melt and chain screening. Stress fluctuations are frozen on...

Rouse Mode Analysis of Chain Relaxation in Homopolymer Melts

We use molecular dynamics simulations of the Kremer-Grest (KG) bead-spring model of polymer chains of length between 10 and 500, and a closely related analogue that allows for chain crossing, to clearly delineate the effects of entanglements on the length-scale-dependent chain relaxation in polymer melts. We analyze the resulting trajectories using the Rouse modes of the chains and find that en...