Interpretation of the observed influence of mesophase structures on the β-relaxation in side chain liquid crystal polymers

✍ Scribed by K. L. Ngai; Andreas Schönhals

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 144 KB
• Volume: 36
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(199808)36:11<1927::aid-polb14>3.0.co;2-9

✦ Synopsis

A strong dependence of the rotational dynamics of the mesogenic units ( brelaxation) on the order of the mesophase was found in sidechain liquid crystal polymers. The preexponential frequency factor, f * bϱ , and the activation energy, E* ab , of the b-relaxation rate both increase significantly (i.e., obeying a compensation law) with increasing order of the mesophase which is accompanied by a decrease of the mean lateral mesogenic distance. In this work, we show how these experimental results can be interpreted in a quantitative manner by using the general results of the coupling model for cooperative motions.