ISSN:
1435-1536
Keywords:
Key words NLO materials
;
Pockels-effect
;
dielectric relaxation spectroscopy
;
physical aging
;
amorphous side chain polymers
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The relaxation of the polar order of poled side chain polymers carrying NLO-active chromophores was monitored by Pockels-effect relaxation studies. Dielectric relaxation investigations were performed in order to analyze the coupling or decoupling of the chromophore reorientation to the relaxation modes of the side chain polymers. It was found that the chromophores perform their own reorientation relaxation mode both in the molten and the glassy state, which is not coupled to backbone relaxations. The chromophore reorientation process is characterized by a narrow distribution of the relaxation times and high activation energies. Studies on physical aging reveal that the chromophore reorientation is controlled by the free volume. The chromophore reorientation process can be influenced by the chemical linkage of the chromophore to the polymer backbone and by the nature of the backbone.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s003960050077
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