Self-diffusion of multiarm star polymers in solution far from and near the ordering transition

G. Fleischer*, G. Fytas, D. Vlassopoulos, J. Roovers, Nikolaos Hadjichristidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The self-diffusion of three 128-arm polybutadiene star solutions in toluene was investigated over a broad concentration range from dilute to the ordering region with pulsed field gradient NMR (PFG-NMR). The strong concentration dependence of the self-diffusion coefficient in the fluid state is distinguished clearly from that of linear chains and can be described by a non-Arrhenius VFT-like equation with the concentration playing the role of inverse temperature. In the concentrated regime, the observation of two dynamic phases reflects the coexistence of crystalline and liquid phases over a limited concentration region. The concentration dependences of both the ordinary (fluid-like) diffusion and the completely restricted in-cage motion of these hyper stars are in agreement with the behavior of concentrated colloidal suspensions.

Original languageEnglish (US)
Pages (from-to)266-278
Number of pages13
JournalPhysica A: Statistical Mechanics and its Applications
Volume280
Issue number3
DOIs
StatePublished - Jun 1 2000

ASJC Scopus subject areas

  • Statistics and Probability
  • Condensed Matter Physics

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