Dynamics of star polymers: Evidence for a structural glass transition

被引：30
作者：
Stellbrink, J
Allgaier, J
Richter, D
机构：
[1] IFF, Forschungszentrum Jülich, Jülich
来源：
PHYSICAL REVIEW E | 1997年 / 56卷 / 04期
关键词：
D O I：
10.1103/PhysRevE.56.R3772
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
The dynamics of an 18-arm poly(isoprene) star polymer (M-n(arm)=7360 g/mol) is investigated by dynamic light scattering and viscometry. Above the overlap concentration c* the intensity autocorrelation functions show a two-step decay, which implies the existence of long range correlations, xi not similar or equal to 100 nm. A similar length scale can 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.
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收藏
页码：R3772 / R3775
页数：4
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