| 초록 |
In this study, new aromatic polyimides containing a mesogenic biphenyl carbonitrile unit and biphenyl unit in the side chains were synthesized and characterized for applicable material as LC alignment layer. The biphenyl carbonitrile group as a mesogen was chosen because an enhanced polar interaction between the biphenyl carbonitrile and the LC molecules. Two new monomeric diamines 2,2-bis{3-amino-4-{ω-[4-(4-cyanophenyl)phenoxy]decyloxy}phenyl}hexafluoropropane and 2,2-bis{3-amino-4-[ω-(4-phenylphenoxy)decyloxy]phenyl}hexafluoropropane were synthesized by Mitsunobu etherification of 10-[4-(4-cyanophenyl)phenoxy]decan-1-ol and 10-(4-phenylphenoxy)decan-1-ol, respectively, with 2,2-bis(3-phthalimido-4-hydroxyphenyl)hexafluoropropane followed by deprotecting of the phthalimido groups using hydrazine monohydrate. The monomeric diamines were identified by FT-IR, 1H-NMR, 13C-NMR spectroscopic methods and used to prepare polyimides with commercially available dianhydrides such as PMDA, 6FDA, BTDA, and ODPA. Polyimides were characterized by FT-IR, TGA, DSC, UV and WAXS. |
