Abstract
The odd-even effect of the alkyl chain length of rubbed polyimide (PI) Langmuir-Blodgett (LB) surfaces on the extrapolation length of 5CB has been successfully evaluated by measuring polar anchoring strength. The extrapolation length of 5CB for rubbed PI-LB surfaces with even numbers is small compared with odd numbers for alkyl chain lengths of greater than 7 carbons. The extrapolation length of 5CB on rubbed PI-LB surfaces with odd numbers increases gradually as the temperature increases but tends to diverge near the clearing temperature (Tc = 35.3 °C). The extrapolation length diverges because of rapidly decreasing surface order near Tc. It is suggested that the polar anchoring strength on rubbed PI-LB surfaces with an even number is strong because of relatively high surface ordering caused by more crystalline surfaces. Finally, it is concluded that the odd-even effects of the polar anchoring strength in nematic liquid crystals (NLCs) are strongly related to the character of the polymer and observed clearly for long alkyl chain lengths.
| Original language | English |
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| Pages | 603-605 |
| Number of pages | 3 |
| Publication status | Published - 1997 |
| Event | Proceedings of the 1997 5th IEEE International Conference on Properties and Applications of Dielectric Materials. Part 1 (of 2) - Seoul, Korea Duration: 1997 May 25 → 1997 May 30 |
Other
| Other | Proceedings of the 1997 5th IEEE International Conference on Properties and Applications of Dielectric Materials. Part 1 (of 2) |
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| City | Seoul, Korea |
| Period | 97/5/25 → 97/5/30 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Materials Chemistry