The distribution of tunnelling frequencies for methyl group rotation in poly(vinyl acetate)

被引：4
|
作者：
Moreno, AJ
Alegría, A
Colmenero, J
Mukhopadhyay, R
Frick, B
机构：
[1] UPV, EHU, Dept Fis Mat, San Sebastian 20080, Spain
[2] UPV, EHU, CSIC, Ctr Mixto, San Sebastian 20080, Spain
[3] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India
[4] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 2001年 / 287卷 / 1-3期
关键词：
D O I：
10.1016/S0022-3093(01)00580-4
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The methyl group rotational tunnelling in poly(vinyl acetate) (PVAc) has been analysed by means of neutron scattering covering a range of tunnelling frequencies from 0.5 mu eV to the free rotor line at 0.65 meV. The measured spectra show an apparently quasielastic broadening that has been interpreted in terms of a distribution of tunnelling frequencies. The results obtained in present experiments support those obtained previously from the analysis of the tunnelling spectrum in a smaller width window in combination with measurements in the classical hopping regime. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：242 / 245
页数：4
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