一种新型二元胺4-(3’,5’-二氨基苯甲酸苯酚酯基)苯甲酸(4-正丁氧基)苯酯及其相应聚酰亚.pdfVIP

Synthesis of A Novel Diamine 4-((4’-butoxyphenoxy)carbonyl)phenyl- 3’’,5’’-diamino-benzoate and Corresponding Polyimides1 Ligang Ren1 Xiangyang Liu1 Yi Gu1 State Key Laboratory of Polymeric Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, Sichuan, P. R. China 610065 email:guyi@ Abstract A novel diamine 4-((4’-butoxyphenoxy)carbonyl)phenyl-3’’,5’’-diaminobenzoate (BCDA) was synthesized from 4-butoxyphenol, 4-hydroxybenzoic acid and 3,5-dinitrobenzoic acid through four main intermediates, and a series of polyimides based on it were also synthesized. All the intermediates and the final product were characterized by FTIR and 1H-NMR. The key step in synthesis route is selective hydrolyzation of two ester bonds in 4-butoxyphenyl-4 ’- acetoxybenzoate ，by adjusting the reaction temperature and the concentration of ammonia, the reaction time is shortened to 8 hours. A preliminary study on the properties of the novel polyimides such as the aggregation structures, glass transition temperature, solubility and the pretilt angles of these polyimides were carried out. Keywords: Synthesis, polyimides, side-chain, alignment film. 1 Introduction Polyimide films are widely used in liquid crystal display (LCD) devices to control the alignment of liquid crystals (LCs) in conn