ROTATIONAL-DYNAMICS OF ANTHRACENE AND 9,10-DIMETHYLANTHRACENE IN POLYISOPRENE

被引:56
作者
HYDE, PD [1 ]
EDIGER, MD [1 ]
机构
[1] UNIV WISCONSIN,DEPT CHEM,MADISON,WI 53706
关键词
D O I
10.1063/1.458166
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Singlet and triplet transient grating experiments have been used to measure rotational correlation functions for anthracene and 9,10-dimethylanthracene in cis-polyisoprene from Tg + 120 °C to Tg + 20 °C. Over this temperature range, the rotational correlation time varies by seven decades and follows the temperature dependence of the bulk viscosity. The observed correlation functions are not consistent with predictions of the anisotropic rotational diffusion model. The observed correlation functions for anthracene are consistent with a change in the predominant axis for rotational diffusion as a function of temperature. At high temperatures, in-plane rotation occurs most rapidly, while at low temperatures rotation about the long axis predominates. © 1990 American Institute of Physics.
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页码:1036 / 1044
页数:9
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