CORRELATION BETWEEN NON-DEBYE BEHAVIOR AND Q-BEHAVIOR OF THE ALPHA RELAXATION IN GLASS-FORMING POLYMERIC SYSTEMS

被引：172

作者：

COLMENERO, J ^{[1
]}

ALEGRIA, A ^{[1
]}

ARBE, A ^{[1
]}

FRICK, B ^{[1
]}

机构：

[1] INST MAX VON LAUE PAUL LANGEVIN, F-38042 GRENOBLE, FRANCE

来源：

PHYSICAL REVIEW LETTERS | 1992年 / 69卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.69.478

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

By means of quasielastic neutron scattering we have shown that the dynamics of the alpha-relaxation on three different polymeric glasses shows a clear non-Debye behavior on a mesoscopic time scale. The spectral shape is found to be independent of temperature and momentum transfer (Q). The characteristic relaxation time follows a power-law Q dependence, tau (Q) is-proportional-to Q(-n) (n > 2), n being dependent on the system. We found that the Q behavior and the non-Debye behavior are directly correlated. These results have important implications concerning the physical mechanisms behind the dynamics of the alpha-relaxation.

引用

页码：478 / 481

页数：4

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