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Nematic conformation of oxyethylene spacers involved in main‐chain liquid crystals
Author(s) -
Furuya Hidemine,
Iwanaga Hiroshi,
Nakajima Takeshi,
Abe Akihiro
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200390033
Subject(s) - liquid crystal , mesogen , dimer , crystallography , polymer , molecule , materials science , phase (matter) , alkane , chain (unit) , chemistry , liquid crystalline , polymer chemistry , organic chemistry , hydrocarbon , physics , optoelectronics , astronomy
2 HNMR measurements were performed on main‐chain dimer and polymer liquid crystals (LC) having oxyethylene (OE) spacers ‐(OCH 2 CH 2 ) x O‐(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 Δ ν /Δ ν R (Δ ν : spacer and Δ ν R : 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(CH 2 ) n O‐ (n=9, 10).