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

G Fleischer, G Fytas, D Vlassopoulos, J Roovers and N Hadjichristidis

Physica A: Statistical Mechanics and its Applications, 2000, vol. 280, issue 3, 266-278

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.

Keywords: Hyper star polymers; Non-dilute solutions; Self-diffusion; Colloidal behavior (search for similar items in EconPapers)
Date: 2000
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:280:y:2000:i:3:p:266-278

DOI: 10.1016/S0378-4371(99)00604-4

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