Intermediate length scale dynamics of polyisobutylene

被引：83

作者：

Farago, B. ^{[1
]}

Arbe, A. ^{[2
]}

Colmenero, J. ^{[2
,3
,4
]}

Faust, R. ^{[5
]}

Buchenau, U. ^{[6
]}

Richter, D. ^{[6
]}

机构：

[1] Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France

[2] U. de Física de Materiales, Apartado 1072, 20080 San Sebastián, Spain

[3] Depto. de Fis. de Materiales, Universidad del Pais Vasco, EHU, Apartado 1072, 20080 San Sebastián, Spain

[4] Donostia Intl. Physics Center, Apartado 1072, 20080 San Sebastián, Spain

[5] Polymer Science Program, Department of Chemistry, University of Massachusetts-Lowell, One University Avenue, Lowell, MA 01854

[6] Inst. F. Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany

来源：

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | 2002年 / 65卷 / 05期

关键词：

Acoustic waves - Dynamics - Glass - Hydrodynamics - Neutrons - Stress relaxation - Temperature distribution - Viscosity;

D O I：

10.1103/PhysRevE.65.051803

中图分类号：

学科分类号：

摘要：

We report on a neutron spin echo investigation of the intermediate scale dynamics of polyisobutylene studying both the self-motion and the collective motion. The momentum transfer (Q) dependences of the self-correlation times are found to follow a Q-2/β law in agreement with the picture of Gaussian dynamics. In the full Q range of observation, their temperature dependence is weaker than the rheological shift factor. The same is true for the stress relaxation time as seen in sound wave absorption. The collective times show both temperature dependences; at the structure factor peak, they follow the temperature dependence of the viscosity, but below the peak, one finds the stress relaxation behavior. ©2002 The American Physical Society.

引用

页码：1 / 051803