| Autor: |
E. Tomchuk, J. J. Visintainer, B. Nakka, Ronald Y. Dong, E. Bock |
| Rok vydání: |
1977 |
| Předmět: |
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| Zdroj: |
Molecular Crystals and Liquid Crystals. 38:53-59 |
| ISSN: |
0026-8941 |
| Popis: |
The proton spin dipolar relaxation times and dipolar echo responses were studied for the nematic phase of ring-deuterated p-methoxybenzylidene-p-n-butylaniline (MBBA-d) as a function of temperature and frequency. Measurements of the proton dipolar echo responses were also made for methyl-deuterated p-azoxyanisole (PAA-d6). The echo response was used to determine the inter-pair second moment M2 (inter), while the total second moment M2 was extracted from the echo shape. Both of these second moments were determined for the ring protons in PAA-d6 and the end chain protons in MBBA-d8 and are discussed in terms of the averaging caused by the internal motions of the molecules. The dipolar relaxation times measured for the side chain protons in MBBA-d8 indicate a lower “effective” viscosity for this part of the molecule. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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