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New hydrogen-bonded comblike polyimides with mesogenic side chains for stable orientation and fast switching of liquid crystals
Authors:Chunho Kim  Intae Son  Jae Hong Kim  Ji Yong Yoo  Byungsun Lee
Institution:Department of Chemical Engineering, Myongji University, Yongin, Korea
Abstract:ABSTRACT

New supramolecular comblike polyimides with mesogenic side chains for stable homeotropic orientation and fast electro-optical switching of liquid crystals (LCs) have been prepared through selective intermolecular hydrogen bonding between 4-(4-heptylphenyl)benzoic acid (4HPB) and host polyimide. A low concentration of 4HPB as the mesogenic guest molecule was hydrogen-bonded to polyimide backbone leading to the self-assembled comblike polyimide with enhanced homeotropic orientation properties. The electro-optical characteristics of the LC device containing hydrogen-bonded comblike polyimide exhibited better performance than those of LC cell with conventional polyimide. Because the conventional covalent approach for preparation of polyimides requires considerable synthetic efforts to achieve new functionality in polyimide materials, the proposed noncovalent method is a simple one and highly cost effective. Our controlled methodology should find wide application for the fabrication of functional alignment materials requiring high orientation ability.
Keywords:Comblike polyimide  hydrogen bonding  liquid crystal  mesogenic side chain  noncovalent synthesis
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