A generalized Zimm model: Hydrodynamic screening in polymer solutions

✍ Scribed by T. Tchesskaya

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 293 KB
• Volume: 150
• Category: Article
• ISSN: 0167-7322
• DOI: 10.1016/j.molliq.2009.10.004

✦ Synopsis

This work presents a phenomenological theory for the single-chain dynamics in semidilute and concentrated polymer solutions and allows to describe the crossover from Zimm to Rouse-like behavior both in time domain and in spatial domain. The polymer solution is described as a set of oscillators fixed in space and submerged in an incompressible fluid. It is shown that the coupled equations of motion of such a polymer system give rise to the time dependence of the Oseen-like tensor and, as a consequence, the time-dependent hydrodynamic screening length. Monomer mean-square displacements and the single-chain dynamic structure factor are calculated.