Nematic conformation of oxyethylene spacers involved in main-chain liquid crystals |
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| Authors: | Hidemine Furuya Hiroshi Iwanaga Takeshi Nakajima Akihiro Abe |
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| Affiliation: | 1. Tokyo Institute of Technology, Department of Organic and Polymeric Materials, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan;2. Fuji Photo Film Co. Ltd., Ashigara Research Laboratories, 210 Nakamura, Minamiashigara 250-0193, Japan;3. SunAllomer Ltd., Kawasaki Development Center, 2-3-2 Yako, Kawasaki-ku, Kawasaki 210-8548, Japan;4. Tokyo Institute of Polytechnics, Department of Applied Chemistry, 1583 Iiyama, Atsugi 243-0297, Japan |
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| Abstract: | 2HNMR measurements were performed on main-chain dimer and polymer liquid crystals (LC) having oxyethylene (OE) spacers -(OCH2CH2)xO-(x=2, 3). The orientational as well as conformational characteristics of these molecules have been investigated in bulk and in a nematic solution. The OE spacer was found to take spatial arrangements characteristics of the nematic phase. The nematic conformation of the spacer remains nearly invariant over a wide range of temperature and concentration. In these analyses, the ratio of the deuterium quadrupolar splittings Δν/ΔνR (Δν: spacer and ΔνR: mesogenic unit) provided an important information regarding the spatial configuration of molecules in the LC state. The results obtained in this study are consistent with our previous conclusion drawn on a series of main-chain LC oligomers and polymers comprising n-alkane spacers -O(CH2)nO- (n=9, 10). |
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