Stress relaxation of bi-disperse polystyrene melts

Interpretations of the real time scattering experiment for polystyrene melts during stress relaxation

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...

Stress relaxation in entangled melts of unlinked ring polymers.

Stress relaxation in unlinked ring polymer melts poses an important challenge to our theoretical understanding of entangled polymer dynamics. Recent experiments on entangled unlinked ring melts show power-law stress relaxation with no hint of a rubbery plateau, usually the hallmark of entangled polymers. Here we present a theory for stress relaxation in rings analogous to the successful approac...

Syddansk Universitet Stress Relaxation in Entangled Polymer Melts

RAFT-based Polystyrene and Polyacrylate Melts under Thermal and Mechanical Stress

Although controlled/living radical polymerization processes have significantly facilitated the synthesis of welldefined low polydispersity polymers with specific functionalities, a detailed and systematic knowledge of the thermal stability of the products−highly important for most industrial processes−is not available. Linear polystyrene (PS) carrying a trithiocarbonate mid-chain functionality ...