| 초록 |
We synthesized the three new dianhydrides, 1,4-bis (4’-t-butylphenyl) pyromellitic dianhydride (BBPD), 1,4-bis-(4’-trimethylsilylphenyl) pyromellitic dianhydride (BTPD), and 2,2’-bis(4”-tert-butylphenyl)-4,4’,5,5’-biphenyltetracarboxylic dianhydride (BBBPAn) and a series of new organosoluble polyimides: BBPD-ODA, BBPD-MDA, BBPD-FDA, BTPD-FDA, and BBBPAn-FDA using the corresponding diamines: 4,4’-oxydianiline (ODA), 4,4’-methylenediamine(MDA), 4,4’-(hexafluoroisopropylidene)dianiline (6FDA) to elucidate the anisotropic interactions between the oriented polymer chain segments and the LC molecules and to define the contribution of the chemical components of polymer segment to the film surface topography, the LC alignment, pretilt, and anchoring energy. |
