Determination of angular correlations in atactic PMMA by measurement of the temperature dependent Kerr effect

✍ Scribed by K. Ullrich; B.-J. Jungnickel

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 544 KB
• Volume: 21
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(85)90203-4

✦ Synopsis

Measurements of electric birefringence (Kerr effect) were performed with atactic poly(methyl methacrylate) (PMMA) at temperatures between room temperature and 145 °. The electro-optical response of the sample material consists of two components, which can be attributed to the ~-and fi-relaxation respectively. Whilst the time dependence of the latter could not be resolved with the equipment used, just above the glass transition temperature the s-relaxation elapsed within a few minutes. The relaxation times differed remarkably for rise and decay of the birefringence; the same behaviour was observed for the Kerr constants of the two components. From the results, a slight spatial orientation correlation could be concluded.