Crossover from independent to cooperative segmental dynamics in polymers: Experimental realization in poly(vinyl chloride)

被引:68
作者
Colmenero, J
Arbe, A
Coddens, G
Frick, B
Mijangos, C
Reinecke, H
机构
[1] CENS, LAB LEON BRILLOUIN, F-91191 GIF SUR YVETTE, FRANCE
[2] INST MAX VON LAUE PAUL LANGEVIN, F-38042 GRENOBLE, FRANCE
[3] CSIC, INST CIENCIA & TECNOL POLIMEROS, E-28006 MADRID, SPAIN
关键词
D O I
10.1103/PhysRevLett.78.1928
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We show that the crossover from exponential to nonexponential behavior displayed in the short-time range by the local segmental relaxation in polymers leads to the existence of a temperature T* at which the dynamics changes from independent to cooperative. T* depends on the C-C rotational barrier in the polymer chain and is momentum-transfer dependent. This dependence, which reflects the diffusive nature of the segmental dynamics, allows the direct observation of the dynamical change at T* by means of neutron scattering.
引用
收藏
页码:1928 / 1931
页数:4
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