Abstract
The polar anchoring energy, the surface order parameter, and the pretilt angles in the nematic liquid crystals (NLC) 4-n-pentyl-4'-cyanobiphenyl (5CB) have been successfully investigated on rubbed soluble polyimide (PI) surfaces with a helical backbone structure and trifluoromethyl moieties. The observed pretilt angle of 5CB is about 15° in the wide rubbing region of rubbed soluble PI surfaces with trifluoromethyl moieties attached to the lateral benzene rings. It is thought that the microscopic surface structure of the polymer contributes to the pretilt angle generation at the surface. Also, we have found that the polar anchoring energy of 5CB is dependent on the molecular structure of the rubbed PI surfaces. The polar anchoring energy of 5CB on the rubbed soluble PI surfaces with trifluoromethyl moieties attached to the lateral benzene rings is smaller than that of the rubbed soluble PI surfaces with trifluoromethyl moieties attached to the polymer backbone. Consequently, the polar anchoring energy of 5CB strongly depends on the surface ordering of the rubbed soluble PI surfaces.
| Original language | English |
|---|---|
| Pages (from-to) | 29-33 |
| Number of pages | 5 |
| Journal | Journal of the Korean Physical Society |
| Volume | 36 |
| Issue number | 1 |
| Publication status | Published - 2000 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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Anchoring strength and high pretilt angle in NLC on rubbed organic solvent soluble polyimide surfaces with trifluoromethyl moieties. / Seo, Dae Shik.
In: Journal of the Korean Physical Society, Vol. 36, No. 1, 01.01.2000, p. 29-33.Research output: Contribution to journal › Article
TY - JOUR
T1 - Anchoring strength and high pretilt angle in NLC on rubbed organic solvent soluble polyimide surfaces with trifluoromethyl moieties
AU - Seo, Dae Shik
PY - 2000/1/1
Y1 - 2000/1/1
N2 - The polar anchoring energy, the surface order parameter, and the pretilt angles in the nematic liquid crystals (NLC) 4-n-pentyl-4'-cyanobiphenyl (5CB) have been successfully investigated on rubbed soluble polyimide (PI) surfaces with a helical backbone structure and trifluoromethyl moieties. The observed pretilt angle of 5CB is about 15° in the wide rubbing region of rubbed soluble PI surfaces with trifluoromethyl moieties attached to the lateral benzene rings. It is thought that the microscopic surface structure of the polymer contributes to the pretilt angle generation at the surface. Also, we have found that the polar anchoring energy of 5CB is dependent on the molecular structure of the rubbed PI surfaces. The polar anchoring energy of 5CB on the rubbed soluble PI surfaces with trifluoromethyl moieties attached to the lateral benzene rings is smaller than that of the rubbed soluble PI surfaces with trifluoromethyl moieties attached to the polymer backbone. Consequently, the polar anchoring energy of 5CB strongly depends on the surface ordering of the rubbed soluble PI surfaces.
AB - The polar anchoring energy, the surface order parameter, and the pretilt angles in the nematic liquid crystals (NLC) 4-n-pentyl-4'-cyanobiphenyl (5CB) have been successfully investigated on rubbed soluble polyimide (PI) surfaces with a helical backbone structure and trifluoromethyl moieties. The observed pretilt angle of 5CB is about 15° in the wide rubbing region of rubbed soluble PI surfaces with trifluoromethyl moieties attached to the lateral benzene rings. It is thought that the microscopic surface structure of the polymer contributes to the pretilt angle generation at the surface. Also, we have found that the polar anchoring energy of 5CB is dependent on the molecular structure of the rubbed PI surfaces. The polar anchoring energy of 5CB on the rubbed soluble PI surfaces with trifluoromethyl moieties attached to the lateral benzene rings is smaller than that of the rubbed soluble PI surfaces with trifluoromethyl moieties attached to the polymer backbone. Consequently, the polar anchoring energy of 5CB strongly depends on the surface ordering of the rubbed soluble PI surfaces.
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M3 - Article
AN - SCOPUS:0034345967
VL - 36
SP - 29
EP - 33
JO - Journal of the Korean Physical Society
JF - Journal of the Korean Physical Society
SN - 0374-4884
IS - 1
ER -