DYNAMICS OF STAR POLYMERS - EVIDENCE FOR A STRUCTURAL GLASS-TRANSITION

Authors
STELLBRINK J ALLGAIER J RICHTER D
Citation
J. Stellbrink et al., DYNAMICS OF STAR POLYMERS - EVIDENCE FOR A STRUCTURAL GLASS-TRANSITION, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 56(4), 1997, pp. 3772-3775
Citations number
24
Categorie Soggetti
Physycs, Mathematical","Phsycs, Fluid & Plasmas
Journal title
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics → ACNP
ISSN journal
1063651X
Volume
56
Issue
4
Year of publication
1997
Pages
3772 - 3775
Database
ISI
SICI code
1063-651X(1997)56:4<3772:DOSP-E>2.0.ZU;2-D
Abstract
The dynamics of an 18-arm poly(isoprene) star polymer (M-n(arm)=7360 g /mol) is investigated by dynamic light scattering and viscometry. Abov e the overlap concentration c the intensity autocorrelation functions show a two-step decay, which implies the existence of long range corr elations, xi not similar or equal to 100 nm. A similar length scale ca n be derived from the q dependence of the static scattering intensity, which reveals a strong excess scattering at low q. These experimental results are an indication for a structural glass transition at higher concentrations as known from colloidal systems.