Direct observation of the crossover from α-relaxation to Rouse dynamics in a polymer melt

被引：21

作者：

Richter, D ^{[1
]}

Monkenbusch, M

Willner, L

Arbe, A

Colmenero, J

Farago, B

机构：

[1] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany

[2] EHU, UPV, CSIC, Unidad Fis Mat, E-28080 San Sebastian, Spain

[3] EHU, UPV, Dept Fis Mat, E-28080 San Sebastian, Spain

[4] Donostia Int Phys Ctr, E-28080 San Sebastian, Spain

[5] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

来源：

EUROPHYSICS LETTERS | 2004年 / 66卷 / 02期

关键词：

D O I：

10.1209/epl/i2003-10180-5

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this letter we report a large experimental effort exploring the dynamics of poly(vinyl ethylene) on length scales covering Rouse dynamics and below. The results establish the simultaneous existence of a generic sublinear diffusion regime which underlies the a-process in addition to the Rouse process. Both regimes are separated by a well-defined dynamic crossover. From that the size of the Gaussian blobs making up the Rouse model is determined directly. Following this observation, we may identify the universal glassy dynamics with subdiffusive motions occurring within these Gaussian blobs.

引用

页码：239 / 245

页数：7

共 12 条

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