Photo-Alignment Characteristics of Charge-Transfer Complexes Forming Polyimides with Tetramethyl Phenylene Diamine

摘要

The photo-alignment characteristics of 2,3,5,6-tetramethyl-1,4-phenylene diamine (TeMPD)-based polypes wxth a good electron-releasing property were systematically investigated, such as 3 3,4,4-diphenylsulfonetetracarboxylic dianhydride-TeMPD, 4,4-(hexafluoroisopropylidene) diphthahc anhydride-TeMPD and cyclobutane-1,2,3,4-tetracarboxyhc dianhydride-TeMPD TeMPD-based polyimides with various charge-transfer energy levels, varying from the lowest occupy modular orbital in the diamine component of the polyimide to the highest occupied molecular orbital m the acid component, were used. All of the TeMPD-based polyimide films irradiated with linearly polanzed ultraviolet light exhibited photo-alignment characteristic with the same direction regardless of the different imidization ratios. The chemical structure and electronic state depended on the formation of charge-transfer complexes and did not affect the apparent photo alignment.